. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. FAIRY-RING FUNGI. 481 the grass in the roots of which it grows, and so causing the brown ring, on which an abundant crop of toad-stool fruits forms in the fall, which by their decay enrich the soil so that it produces a ranker vegetation the next season. An appearance which may be called false fairy-rings is occa- sionally produc
. Grasses of North America [microform] : chapters on the physiology, composition, selection, improving and cultivation of grasses, management of grass lands, also chapters on clovers, injurious insects and fungi. Grasses; Forage plants; Graminées; Plantes fourragères. FAIRY-RING FUNGI. 481 the grass in the roots of which it grows, and so causing the brown ring, on which an abundant crop of toad-stool fruits forms in the fall, which by their decay enrich the soil so that it produces a ranker vegetation the next season. An appearance which may be called false fairy-rings is occa- sionally produced by Physarum cinereum, one of the slime-molds, on the leaves and stems of grasses. This fungus grows unnoticed on decaying matter in the ground, often creeping out in a regular manner from its starting point until a more or less perfect circle ,Bix or seven feet in diameter is formed, when it suddenly appears upon the plants it has grown under, and produces its dusty, ash- colored fruit in such abundance as to attract attention from a distance. From its mode of life, it does little if any harm to the grass, further than to make a little of it unpalatable to animals. 16. Root-gall fungi of clover, etc.—Galls which vary in size and shape, according to the species ex- amined, are always found in greater or less number on the roots of norm- ally grown leguminosae. They are caused by one or more microscopic fuugijsometimes referred to the genus lihizoUum, widely distributed in the soil where leguminous plan!.? are grown. The fungus penetrates the tender rootlets,especially through the root hairs, giving rise to the develop- ment of galls, but its presence, un- like that of most gall-producing species, appears to be beneficial to the plants attacked, since it seems now fairly demonstrated that the assimilation of atmospheric nitrogen, which has long been attributed to leguminous crops, is effected by them through the agency of these FiQ. Please note that these ima
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
