Product Listing

Sylvan provides an extensive collection of cultivated mushroom species in their laboratories in the U.S. (Kittanning) and France (Langeasis) available to their customers. In addition to our commercial strains, this collection includes many wild strains that have been collected and maintained for decades, unique to Sylvan.

More than 600 strains of over 50 species currently reside in the collection, many obtained by tissue culture and/or spore collection from mushrooms throughout the world including Europe, Asia and various parts of the Americas.

This unique strain collection allows the company to explore a novel germplasm depository, representing a valuable source of genetic diversity critical to our breeding programs. This collection of strains benefits grower’s market development prospects and security for crop longevity.

Fresh White

A15 fits a range of compost growing systems and produced medium to large mushrooms of good quality and high yield. It responds well to supplementation and produces excellent quality mushrooms for the fresh market. It is grown throughout Europe and produces a mushroom with high-density, a tight veil and a smooth, round cap. A15 grow best in consistent, good quality active compost with a good differential between air and compost temperature but are tolerant of compost variation. The target for water content at filling is 66%. Optimum mycelium growth occurs by day 15 to 16 at a compost temperature of 25° to 26°. Care should be taken that the compost is not over compressed at filling, particularly if it is wet and lacks structure.


737 is a high quality, mid-range hybrid with the traits of a large off-white hybrid while retaining the flexibility of the smooth white hybrid.  Sylvan mid-hybrids produce medium to large mushrooms of good quality and high yield. Under proper growing conditions, 737 can be larger and denser than any other in the mid-range hybrid class. 737 grow best in consistent, good quality active compost with a good differential between air and compost temperature but are tolerant of compost variation. The target for water content at filing is 66%.  The compost should be supplemented at between 1 and 1.5 kg/m2 and the shelf lined with plastic in order to maintain compost activity in later flushes. This strain yields superior performance in well-managed compost with dense casing layers.

S28 is the newest midrange off-white hybrid offered by Sylvan. Its vigorous growth provides excellent colonization and growth, even when conditions are slightly less than optimal. Mid-hybrid strains grow best in consistent, good quality active compost with a good differential between air and compost temperature but are tolerant of compost variations. The colonization rate during spawn run is quicker than most other mid-range off-white hybrids. S28’S ability to set many pins can be easily managed to suit your quality and yield needs. The colour, density, and overall quality of S28 has proven to be superior to other strains. There are multiple management techniques which can be utilized during case hold and pin set to optimize your desired yield and quality needs.


Mechanical Harvesting Strains

512 produces a solid stripe and round, firm, medium sized mushroom. It produces relatively even flushes, thus spreading the harvesting period. 512 is a reliable, high yielding, flexible strain that can be grown under a range of conditions. The favourable characteristics of 512 are easy pinning, stems of the correct length for cutting and a tolerance of compost variability.  

520 gives consistent production in terms of weight and quality. The spontaneous pin set and rapid development produce sufficient stem length, guaranteeing an even crop and good harvest. 520 is suitable for the production of both small and large processed mushrooms. 520 is more aggressive than 512 during ‘case run’, pin set and pin development.

512 & 520 are particularly suited to mechanical harvesting. They are tolerant of changing compost and growing conditions and give consistent production in terms of both weight and quality. These strains are easy to pin so mycelial growth must be controlled with a wet, heavy and coarse casing layer. To further control casing colonisation, casing with a controlled watering regime during case running must be used.

A15 produces a compact flesy mushroom with a rounded cap. Stem length is shorter in comparison to our other mechanical strains. The fruit bodies remain closed longer, are easily harvested and are particularly suitable for the small processed mushroom sector (quality and frozen)

Pleurotus Ostreatus Strains

HK35 was the first commercial hybrid Pleurotus strain to be developed. It is an excellent combination of high yielding and high quality Pleurotus strains. Currently it is the most widely grown exotic strain on the European market. It can be grown all year round. The stem connects to the cap in a lateral position and is medium in length. With the addition of more fresh air the stem will become shorter. Depending on the temperature, the colour of the cap varies from dark grey to light grey. HK35 is a high yielding strain that is tolerant to a range of growing conditions, it is easy to crop and produces good quality over several flushes.


KRYOS combines the advantages of both fast and winter strains producing in air temperature of up to 17 °C. KRYOS is high yielding and dark in colour. KRYOS is suitable for autumn and winter production. It produces large mushrooms with a round, large, thick cap and short stem. Best results are obtained by keeping the temperature under 18 °C, relative humidity between 85 and 90% CO2 level under 800ppm and good lighting. When the temperature is lower, the growth of the fruiting bodies slows down but results in mushrooms of better visual and physical quality.

Strain 3014

The Pleurotus Pulmonarius flavour and morphology compare well with wild mushrooms. 3014 tolerates summer growing conditions but it grown well year-round allowing flushes to be well planned. 3014 creates small bunches and produces many spores. The stem is short and white in colour. The cap is medium in size with an average 7 cm diameter and is think and flat in shape. Depending on the temperature the colour ranges from light brown to brown. It has an excellent taste and stores well.


Strain 3040

The Pleurotus Citrinopileatus is bright yellow in colour. Optimum temperatures for fruiting are 16 – 20°C. Above 20°C the caps will discolour and quality will be affected. At lower temperatures quality will be excellent but there will be some loss in yield.

Strain 3253

Strain 3253 is a consistent and firm mushroom that provides a longer shelf-life, high quality mushroom with round and average size cap. It produces best in the autumn and winter seasons and has the characteristics of an aggressive strain. Strain 3253 is a good alternative to HK35.


Strain 3115

Strain 3115 is a winter strain that produces large mushrooms in cold conditions. It has a vigorous mycelium growth adapted to be grown in cold weather. The mushrooms grow to have a very dark colour with large stems.

Fotios Strain

Strain Fotios produces constant quality year-round production. It produces best during spring and autumn. The mushrooms produce a combined greyish-brown dark colour. Strain Fotios produces a high yield and reacts well to low growing temperatures.


Ivory Strain

The Ivory strain is the perfect alternative to grow mushrooms in warm conditions. This strain produces best during the warmer spring and summer months. The Ivory strain produces high quality mushrooms. Strain characteristics include aggressive mycelium growth producing ivory colour mushrooms with round and fleshy cap.

Strain 3009

Strain 3009 is a flexible strain that produces well all year round. It is a great option for growers that like HK35 for warmer temperatures. Strain 3009 has a better tolerance for poor quality compost.


Etna Strain

Etna adapts to all quality varieties of substrates. Etna characteristically produces big bunches with small light colour mushrooms. Etna typically has an aggressive mycelium and is an easy pinning strain for growers who want to ensure high production.

Strain 3029

Strain 3029 is the perfect choice for those looking for excellent and high shelf-life mushrooms. Strain 3029 grows best in the autumn and winter strain and produces a dark grey colour mushrooms. The cap produced is typically round, flat and bigger than the average size. The strain has a short stem that bunches reducing the discards at the time of cutting.


Strain 3014 (Pleurotus pulmonarious)

Pleurotus pulmonarious strain produces best during the summer months. Strain 3014 is highly aggressive and produces a vigorous mycelium that can flourish in warm temperatures. Pleurotus pulmonarious mushrooms produce medium size, thin and flat caps. This strain produces a large number of spores. 3014 has one of the better tasting flavours.

Shiitake Strains


4312 offers the best combination of fast strains and high-quality mushrooms. It is very successful as a fresh market mushroom because of its excellent keeping quality. It produces medium size mushrooms with very firm flesh. The colour is medium to dark brown depending on cultural techniques. The cap is well rounded when young and flattens as it reaches maturity. The first flush appears very strongly around 7 weeks after spawning. 4312 works well in growing systems using pasteurized substrates due to its aggressive growth in sawdust/ straw based substrates and its resistance to Trichoderma.



The 4320 is an additional great combination of fast strains and high-quality mushrooms. The 4320 produces medium to large size, high quality mushrooms. The cap is well rounded, dense and fleshy. The cap is thinner and lighter at higher temperatures.


The 4080 is a very adaptable strain that combines yield with quality. It produces medium sized, quality mushrooms. The cap is well rounded when young and flattens as it reaches maturity. The cap is medium to dark brown depending on growing techniques.


Specialty Strains

Pholiota (Agrocybe aegerita) 4022

4022 grows well on Pleurotus substrate that has been pasteurised for up to 7 days but best results are achieved on sterilised substrate. Optimum growth temperature is 18 °C. Significant ventilation is required to produce the best quality mushrooms. When pinning is excessive the plastic around the substrate should be removed.  

3065 Italian Type

A traditional substrate for Pleurotus growing can be used but this strain prefers sterilised substrates. Optimum air temperature for fruiting is 20°C. The Pleurotus eryngii has a light chestnut brown with darker brown stripes which lighten with age. The flesh is white and has a pleasant smell and sweet flavour. The stem is whiteish and slightly off-centre in relation.


3066 Asian

A traditional substrate for Pleurotus growing can be used but this strain prefers sterilised substrates. Optimum air temperature for fruiting is 20 °C. The length of incubation is directly related to the method of spawning. If you mix the spawn through the substrate, incubation takes around 17 days, it will take 3 months if the spawn is in the bottom of the bag. The 3066 Eryngii has a light chestnut brown with darker brown stripes which lighten with age. The flesh is white, has a pleasant smell and sweet flavour.

Lepista (Lepista nuda) 4102

Sylvan 4102 is a very successful strain that has been a market leader for many years. Lepista nuda is most often grown in the autumn when ambient temperatures are suitable for cultivation.

Grow on pasteurized Agaricus compost rather than on Pleurotus substrate. It is very sensitive when compost Ammonium levels are above 500 ppm at spawning. The stem is violet/blue at base giving it its name “Pied blue” or “Blue feet’. It is most commonly grown at the back of a mushroom house and left to grow naturally. Cropping begins approximately 12-14 weeks from spawning. There are no distinct flushes and mushrooms are generally picked over a 10-12-week period.



SPOPPO (Protected by CPV Rights)

SPOPPO which has HK35 in its genealogy, offers the huge advantage of not producing spores. This prevents lung-related health problems amongst pickers and prevents the spread of infection by spores. It can be grown in similar conditions to those recommended for HK35. It is not as sensitive to extreme conditions or condensation compared with related strains. Colour is cream/light grey to dark brown/ dark grey mainly depending on the air temperature, compost temperature, humidity and the level of evaporation.

Tuscan Brown Strain

The Sylvan Tuscan Brown is a new hybrid strain capable of producing high quality portabellas and creminis. The Tuscan Brown is genetically distinct from other brown strains in the commercial market leading its handling characteristics can be quite different.

Tuscan Brown is a hybrid brown mushroom strain which produces excellent quality and yield for the fresh brown mushroom market. Tuscan Brown’s smooth, deep brown cap contrasts with its gleaming white stem to provide a visually desirable mushroom. The high density of the Tuscan Brown delivers high piece weights and long-lasting shelf life long after harvest. Not only does Tuscan Brown deliver high quality and high yields, it is also very resistant to diseases that plague other brown mushroom strains providing excellent later flushes.

The following suggestions are offered to optimize the performance of the Tuscan Brown:


  • Do not cross Tuscan with any other strain.
  • Scratching or ruffling should be done in the beginning of the case hold period. Late scratching has been associated with a delay in pin set timing.
  • Covering the casing soil with plastic is not necessary nor is it recommended.
  • For heavier first breaks with goof cremini production, the Tuscan may be managed similar to off-white hybrids. This should include achieving good surface coverage of mycelium prior to airing the crop. Light watering only, until the crop is pinned and the mushrooms have grown to dime size. The Tuscan will accept heavier watering than most other strains. The strain is capable of achieving superior density under these conditions.
  • For port production, growers may elect to apply heavier watering earlier in the case hold period, although highly anaerobic conditions should be avoided.
  • There is no need to use manual techniques to darken the Tuscan. The mushrooms will remain dense, with a beautiful brown color and smooth cap throughout the cropping cycle.
  • Third break production from Tuscan can be especially good. Heavier third breaks can accept more water than may be typical of other commercial browns.




Due to its unique reproductive system, the mushroom industry has had a long history of deriving new strains from commercially valuable stocks by such simple means as clonal propagation, single or multi-spore selection. Strains derived in such a way are known as essentially derived varieties or EDV’s and are difficult to identify and difficult for the breeder to protect against. EDV’s numerous patents endorse the importance of a robust variety protection system designed to protect the breeder from unfair competition. The EDV working group has produced a position paper on EDVs/Essentially Derived Varieties in mushrooms. Sylvan supports this initiative.

Sylvan Inc. EDV statement

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