A text-book of mycology and plant pathology . r, it may be pale,sprightly colored, or colorless, neverblack. Hypomyces with sprightlycolored perithecia arises from a thickcrust-like stroma. It lives parasitic-ally on a number of dififerent fleshyfungi. For example, Hypomyceslactifluonim transforms a species ofLactarius into a cinnabarred growthroughly resembling a toadstool andwithout gills, while the original colorof the host is completely lost in thehigher color produced by the without stroma has its peri-thecia developed on the surface of thesubstratum. N. cinnabarina is a
A text-book of mycology and plant pathology . r, it may be pale,sprightly colored, or colorless, neverblack. Hypomyces with sprightlycolored perithecia arises from a thickcrust-like stroma. It lives parasitic-ally on a number of dififerent fleshyfungi. For example, Hypomyceslactifluonim transforms a species ofLactarius into a cinnabarred growthroughly resembling a toadstool andwithout gills, while the original colorof the host is completely lost in thehigher color produced by the without stroma has its peri-thecia developed on the surface of thesubstratum. N. cinnabarina is a par-asite on various deciduous trees (). Its conidial form known as Tuhercularia vulgaris produces flesh-colored eruptions through the bark of various host plants. Nectriaditissima grows on the beech. Polystigma has a crust-like stroma onthe leaves of trees of the genus Prunus, while Epichloe typhina con-fines its parasitic attack to grasses upon which it develops orange-yellow stroma. The genus Cordyceps consists of species which live. Fig. 56.—Ergot (Claviceps pur-purea) on rye head. (After Clinton,G. P., Rep. Conn. Agric. Exper. Stat.,1903-) MILDEWS AND DELATED FUNGI i6i
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