. Minnesota plant diseases. Plant diseases. 30 Minnesota Plant Diseases. rity very qiuckly elevated by a sponge-like stalk to a conspicu- ous height. The spore-mass contains substances that eniit a very strong odor as of carrion; hence the common name of these plants. This odor is very attractive to many insects and apparently the spore mass contains abundant food material for it very soon disappears as a result of the numerous visits of flies and other insects. In some forms of these carrion fungi pure white veil-like or lace-like mantles—in appearance much like a large-meshed Wels- bach mant
. Minnesota plant diseases. Plant diseases. 30 Minnesota Plant Diseases. rity very qiuckly elevated by a sponge-like stalk to a conspicu- ous height. The spore-mass contains substances that eniit a very strong odor as of carrion; hence the common name of these plants. This odor is very attractive to many insects and apparently the spore mass contains abundant food material for it very soon disappears as a result of the numerous visits of flies and other insects. In some forms of these carrion fungi pure white veil-like or lace-like mantles—in appearance much like a large-meshed Wels- bach mantle — are produced. Certain tropical forms, more- over, add a phosphorescence to these mantles so that they at- tract nocturnal insects, and such Fig. 13.—A birds-nest funpus.' To the ^ 11 • i. left are unopened fruiting bodies; formS OpCU USUally at Or JUSt bC- to the right a section of the same; - , , r-^ , • 1 1 • 1 i_ the eggs are chambers, carrying fOre dUSk. Certain moldS mhaO- spores, and the chamber stalks be- ., , 1 1 j • r 1 f • ±. come sticky when moist and prob- it the bodies of larvas ot msects, ably catch in the legs of insects and \--„„ „„_„ „;j.;„„11,, „„ tUa,^ A », are thus distributed. After Engier livmg parasitically ou them. An and Pranti, and Sachs. -^^^^^^ ^^^^ infected may Carry the fungus to a considerable distance and after death numerous spores will be formed which may infect new larvae. The silk- worm is often preyed upon by these fungi. Distribution by other animals. Vertebrate animals are also occasionally agents of spore distribution. Squirrels often feed on certain mushrooms thereby carrying the spores off into their holes. These fungi are the so-called wound parasites which start life as saprophytes in the dead heart-wood of trees and finally grow out into the sap-wood and kill the tree. In the well-protected shelter of such squirrel holes a wound para- site can get a good start. Rabbits and other burrowing an
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