Synonyms: Botrytis dendroides, Chiajaea rhodomela, Cladobotryum dendroides, Dactylium dendroides, Hypolyssus dendroides, Hypomyces roseus, Mucor dendroides, Nectria albertinii, Nectria rhodomela, Nectria rosella, Sphaeria rosella, Thallisphaera rosella.
Common name: pink polypore mould.
Hypomyces rosellus is a parasitic fungus that infects fungi of the genus Russula, particularly species such as Russula viridis and Russula parvovirescens. In East and Central Texas, it has been found to commonly occur in woodland areas, typically on the roots or mycelium of trees, where its hosts are abundant. The fungus produces a pink to reddish-pink, fleshy, and pulvinate fruiting body that ranges from 1-5 cm in diameter, often with a white or yellowish margin. It is usually found during the summer and fall months, particularly after heavy rainfall.
Fungus Hypomyces rosellus(?) on remains of some jelly fungi on a pecan log in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2023
23450 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Close-up of fungus Hypomyces rosellus(?) on remains of some jelly fungi on a pecan log in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323450 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Conidia (in KOH) of pink polypore mould fungus Hypomyces rosellus from Auricularia or Tremella, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023
Hyphae (in Congo Red) of pink polypore mould fungus Hypomyces rosellus from Auricularia or Tremella, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023
Tissues (in Congo Red) pink polypore mould fungus of Hypomyces rosellus from Auricularia or Tremella, collected in Washington-on-the-Brazos State Historic Site. Texas, January 3, 2023Observations of the fungus Hypomyces rosellus in East and Central Texas reveal its presence on remains of jelly fungi on a pecan log in Washington-on-the-Brazos State Historic Site. Close-up examination shows the fungus's growth on the log. Microscopic analysis of conidia in KOH reveals characteristic features of Hypomyces rosellus, confirming its identity. Hyphae stained with Congo Red also exhibit distinctive morphology. Tissue samples stained with Congo Red further support the identification of Hypomyces rosellus, which was found to be parasitizing Auricularia or Tremella fungi. These observations provide insight into the ecology and morphology of Hypomyces rosellus in this region, highlighting its association with specific host fungi and substrates. The findings are based on collections made in Washington-on-the-Brazos State Historic Site, Texas, on January 3, 2023.
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