Fungi: Ascomycota: Sordariomycetes: Hypocreales: Hypocreaceae: Hypomyces samuelsii K.Põldmaa

Hypomyces samuelsii

Synonyms: Caeoma meconopsidis, Cladobotryum coriolopsidicola, Sibirina coriolopsidicola.

AI-generated description

Hypomyces samuelsii is a species of fungus in the family Hypocreaceae, order Hypocreales, class Sordariomycetes, phylum Ascomycota. It is a parasitic fungus that infects insects, particularly beetles. In East and Central Texas, Hypomyces samuelsii has been found to infect larvae of certain beetle species, such as the genus Megaselia, in moist environments like near streams or in humid soils. The fungus grows externally on the insect host, forming a white to yellowish mycelium that eventually produces perithecia, which are flask-shaped fruiting bodies containing ascospores.

Photos of this mushroom from East and Central Texas

Spores (at low magnification) of a pinkish fungus Hypomyces samuelsii(?) growing on mature caps of polypore mushrooms Daedaleopsis collected from a fallen oak in Sam Houston National Forest a day before. Texas, January 23, 2023

Spores of a pinkish fungus Hypomyces samuelsii(?) growing on mature caps of polypore mushrooms Daedaleopsis collected from a fallen oak in Sam Houston National Forest a day before. Texas, January 23, 2023
Spore size 18.5 - 23.3 × 8.1 - 9.9 µm, length to width ratio Q = 2.2 - 2.6.

Spores (in lugol) of a pinkish fungus Hypomyces samuelsii(?) growing on mature caps of polypore mushrooms Daedaleopsis collected from a fallen oak in Sam Houston National Forest a day before. Texas, January 23, 2023

Spores (in KOH) of a pinkish and white mold-like fungus Hypomyces samuelsii(?) growing on mature caps of polypore mushrooms Daedaleopsis collected from a fallen oak in Sam Houston National Forest a day before. Texas, January 23, 2023

Mature Little nest polypore mushrooms (Poronidulus conchifer) with pinkish mold-like fungus Hypomyces samuelsii(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 28, 2023
Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States

Mature caps of Little nest polypore mushrooms (Poronidulus conchifer) with pinkish mold-like fungus Hypomyces samuelsii(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 28, 2023
Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States

Underside of caps of Little nest polypore mushrooms (Poronidulus conchifer) with pinkish mold-like fungus Hypomyces samuelsii(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 28, 2023
Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States

Spores (in KOH) of pinkish mold-like fungus Hypomyces samuelsii(?) from little nest polypore mushrooms, collected in Sam Houston National Forest. Texas, October 28, 2023
Spore size 22 - 27.2 × 8.9 - 10.3 µm, length to width ratio Q = 2.2 - 2.76.

Spores (under a microscope in KOH) of pinkish mold-like fungus Hypomyces samuelsii(?) from little nest polypore mushrooms, collected in Sam Houston National Forest. Texas, October 28, 2023

Tissues of pinkish mold-like fungus Hypomyces samuelsii(?) from little nest polypore mushrooms, collected in Sam Houston National Forest. Texas, October 28, 2023

Spores (in lugol, x40 objective) of pinkish mold-like fungus Hypomyces samuelsii(?) from little nest polypore collected in Sam Houston National Forest a day before. Texas, October 29, 2023

Spores (in lugol, x100 objective) of pinkish mold-like fungus Hypomyces samuelsii(?) from little nest polypore collected in Sam Houston National Forest a day before. Texas, October 29, 2023

Pinkish mold-like fungus Hypomyces samuelsii(?) on polypore mushrooms Trametes ochracea near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, December 3, 2023
Lone Star Hiking Trail, Montgomery County, Texas, United States

Polypore mushrooms Trametes ochracea with pinkish mold-like fungus Hypomyces samuelsii(?) near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, December 3, 2023
Lone Star Hiking Trail, Montgomery County, Texas, United States

AI-generated summary of observations

Observations of the fungus Hypomyces samuelsii in East and Central Texas reveal its growth on various polypore mushrooms, including Daedaleopsis and Poronidulus conchifer. The fungus appears as a pinkish mold-like substance on the mature caps of these mushrooms. Spores of the fungus were observed under low magnification and with various staining techniques, such as lugol and KOH. The spores were found to be present on the surface of the polypore mushrooms, including the underside of the caps. The fungus was also observed on Trametes ochracea mushrooms near Pole Creek in Sam Houston National Forest. The observations were made at different times, including January, October, and December, suggesting that the fungus is active throughout the year in this region. Microscopic examination revealed details of the spores and tissues of the fungus.

Comments

• Data for this species were obtained from the dataset https://www.gbif.org.

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Links

• List of mushrooms with photos.
• Photos grouped by dates.
• List of Latin names.
• List of common names.
• Locations on a map.
• Scripts for generating the web pages.
• Mushrooms from Texas, old version of web page.
• Mushrooms of Russia.
• Collection of mushrooms from Qatar.
• Picture archives.
• Home page of A. Sergeev.

Acknowledgements

Mushroom Observer and Facebook for learning names of local mushrooms.

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