Synonyms: Byssonectria luteovirens, Hypocrea luteovirens, Nectria luteovirens, Peckiella luteovirens, Sphaeria luteovirens.
Common name: Russula Mold.
Hypomyces luteovirens is a parasitic fungus that infects russula and lactarius mushrooms, turning them yellow to greenish-yellow. In East and Central Texas, it has been found on species such as Russula shortii and Lactarius hygrophoroides, typically in deciduous forests and woodlands, particularly under oak, beech, and maple trees. The fungus grows during the summer and fall months, producing perithecia that contain yellow to orange ascospores. It is relatively common in the region, with collections reported from areas including the Piney Woods, Post Oak Savannah, and Blackland Prairie ecoregions.
Fungus Hypomyces luteovirens on underside of brittlegill (Russula) mushroom in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, November 23, 2018
Lone Star Hiking Trail, Shepherd, TX 77371, USA
Dissected brittlegill (Russula) mushroom with fungus Hypomyces luteovirens in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, November 23, 2018Lone Star Hiking Trail, Shepherd, TX 77371, USAObservations of the fungus Hypomyces luteovirens in East and Central Texas reveal its presence on brittlegill (Russula) mushrooms. In the Big Creek Scenic Area of Sam Houston National Forest, specifically in Shepherd, Texas, the fungus was found on the underside of a brittlegill mushroom on November 23, 2018. Upon dissection of the mushroom, the fungus Hypomyces luteovirens was also observed internally. The fungus appears to infect and grow within the mushroom, suggesting a parasitic relationship. These observations provide insight into the habitat and behavior of Hypomyces luteovirens in this region, highlighting its association with brittlegill mushrooms in the wild. The specific location and timing of these observations suggest that the fungus may be active during late fall in East Texas. Further study is needed to fully understand the ecology of this fungus.
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