Common name: rusty-gilled conch.
Extract from Wikipedia article: Crepidotus praecipuus, is a species of fungus in the family Crepidotaceae first described in 2018. It is commonly known as a rusty-gilled conch, along with other kidney shaped, rusty-brown spored species of Crepidotus. It is saprobic on wood, like other Crepidotus species.
Crepidotus praecipuus is a small to medium-sized, fan-shaped or oyster-like fungus that grows on decaying wood. In East and Central Texas, it typically fruits from spring to fall, often in shaded areas with rich soil and abundant woody debris. The cap is 1-4 cm wide, convex to flat, and ranges in color from white to light brown or grayish-brown, sometimes with a wavy or lobed margin. The gills are crowded, narrow, and extend down the stem, which is short, stout, and often lateral or off-center. Microscopic features include ellipsoid to cylindrical spores that are 7-10 μm long and 4-5 μm wide, and club-shaped to cylindrical basidia. This fungus can be found on a variety of substrates, including logs, stumps, and branches of deciduous trees, particularly oak and elm.
Tiny yellow oysterling mushrooms Crepidotus praecipuus(?) in crevices of a dry standing huisache (Acacia) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2023
23900 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Gills of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) in crevices of a dry standing huisache (Acacia) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Underside of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) in crevices of a dry standing huisache (Acacia) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323900 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Close-up of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) on rotting wood of huisache (Acacia) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323900 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Tissues (at low magnification) of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from crevices of a dry standing huisache (Acacia) tree, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2023
Hyphae (in Congo Red) of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from crevices of a dry standing huisache (Acacia) tree, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2023
Basidia and spores of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from crevices of a dry standing huisache (Acacia) tree, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2023
Some conidia in tissues of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from a huisache tree, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023
Tissues and spores at low magnification of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from a huisache tree, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023
Tissues and spores (in Congo Red) of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from a huisache tree, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023
Cystidia(?) of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from a huisache tree, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023
Spores of tiny yellow oysterling mushrooms Crepidotus praecipuus(?) from a dry huisache, collected a day before in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 4, 2023
Spore size 6.9 - 7.5 × 5 - 5.9 µm, length to width ratio Q = 1.3 - 1.4.Observations of the fungus Crepidotus praecipuus in East and Central Texas revealed that it grows on dry standing huisache (Acacia) trees, specifically in crevices and on rotting wood. The tiny yellow oysterling mushrooms were found in Washington-on-the-Brazos State Historic Site, Washington, Texas, on January 3, 2023. Microscopic examination showed the presence of gills, basidia, spores, and hyphae, with some conidia observed in the tissues. The spores and tissues were studied at low magnification and with Congo Red staining, revealing characteristic features of the species. Cystidia-like structures were also observed. Similar observations were made on specimens collected a day later, on January 4, 2023, confirming the presence of Crepidotus praecipuus in the region. The fungus appears to thrive on dead or decaying wood, particularly on huisache trees.
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