Synonyms: Podoscypha diaphana, Stereum diaphanum, Stereum willeyi, Thelephora diaphana, Thelephora sullivantii, Thelephora willeyi.
Cotylidia diaphana is a species of fungus that belongs to the family Rickenellaceae. It is characterized by its thin, membranous to gelatinous fruiting body, typically 1-5 cm in diameter, with a wavy or lobed margin and a translucent to pale yellowish-brown color. In East and Central Texas, Cotylidia diaphana has been found growing on soil, decaying wood, and other organic matter in moist environments, often associated with coniferous or mixed forests. The fungus typically fruits from spring to fall, producing spores that are ellipsoidal to cylindrical in shape and measure 3-5 μm in size.
Small vase shaped mushroom Cotylidia diaphana(?) on floodplain on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, July 7, 2018
Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Underside of Cotylidia diaphana(?) mushroom on floodplain on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, July 7, 2018Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Upper view of mushrooms Cotylidia diaphana in muddy area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 29, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Mushrooms Cotylidia diaphana in muddy area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 29, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Side view of mushrooms Cotylidia diaphana in muddy area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 29, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Close-up of mushrooms Cotylidia diaphana in muddy area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 29, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Spores of mushrooms Cotylidia diaphana collected on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 29, 2022
Small mushrooms Cotylidia diaphana behind an iron bench on rusty gravel soil in Lick Creek Park. College Station, Texas, September 6, 2022Iron Bridge Trail, College Station, Brazos County, Texas, United States
Spores of mushrooms Cotylidia diaphana (size 4.4 x 3.4 micron) collected behind an iron bench on rusty gravel soil in Lick Creek Park. College Station, Texas, September 6, 2022
Spore size 4.3 - 4.6 × 3.21 - 3.7 µm, length to width ratio Q = 1.2 - 1.4.
Small mushroom Cotylidia diaphana in muddy area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 28, 2023Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Upper view of small mushrooms Cotylidia diaphana in Lick Creek Park. College Station, Texas, May 4, 2024Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Young small mushroom Cotylidia diaphana in Lick Creek Park. College Station, Texas, May 4, 2024Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Small mushrooms Cotylidia diaphana on Yaupon Loop Trail in Lick Creek Park. College Station, Texas, May 4, 2024Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Spores of small mushrooms Cotylidia diaphana collected a day before in Lick Creek Park. College Station, Texas, May 5, 2024Observations of the fungus Cotylidia diaphana in East and Central Texas reveal its presence in various locations, including floodplains, muddy areas, and rusty gravel soil. The mushroom was found on Caney Creek Trail in Sam Houston National Forest near Huntsville and Montgomery, as well as in Lick Creek Park in College Station. It typically grows in small, vase-shaped formations, with some observations noting its presence behind an iron bench or in areas with specific soil conditions. The spores of Cotylidia diaphana were collected and measured, ranging in size from 4.4 x 3.4 microns. The fungus was observed on multiple occasions between July 2018 and May 2024, suggesting it may be a relatively common species in the region. Its growth habits and preferred environments are likely tied to moist, possibly disturbed areas.
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