 Abnormally developed milk caps infested by the parasitic sac fungus Hypomyces lateritius ( syn . <unk> <unk> ) are occasionally found in summer and autumn . The infested fruit bodies are usually more or less heavily malformed with a harder and more solid flesh than typical fruit bodies , so that they are more resistant to rot and can even survive the winter . They do not create gills ; instead , the cap bottom is covered by an initially soft , white hyphen fungus , also known as a subiculum . Early on the mycelia becomes denser and takes on a white @-@ grey colour . The perithecia are created after about 10 – 14 days . <unk> are fruit bodies of the Hypomyces and other sac fungi , in which the spindle @-@ shaped asci are produced . Besides L. deterrimus , L. deliciosus and L. sanguifluus can become infested , rarely other milk caps . Hypomyces lateritius , H. ochraceus , H. <unk> , H. odoratus , among other Hypomyces species live parasitically on different milk caps and brittlegills as well as on the fruit bodies of species from other genera . 
