Hypomyces rosellus

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the mycoparasitic fungus Hypomyces rosellus (click on image to enlarge it)
Author(s): Thomas Laxton
Source: Wikimedia Commons

Hypomyces rosellus (Alb. & Schwein.) Tul. & C. Tul. 1860 - (cobweb mould of mushrooms)

This fungus attacks cultivated mushrooms like Agaricus bisporus. PDA cultures of H. rosellus consist of white, cottony, aerial mycelia with the colour changing from white to yellow and finally to pink. The red pigment spreads into the agar. The conidia are hyaline, cylindrical to ellipsoidal, and mostly 2 or 4-celled with a size of around 20 x 10 µm.

Synonyms:
Cladobotryum dendroides
Dactylium dendroides