Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 HERPOTRICHIA. 199 Herpotrichia nigra Hartig. This parasite is distinguished by its grey mycelium, which covers and completely envelops twigs and young plants. On the dwarf mountain pine it is not uncommon to find branches bearing patches of blackened needles closely bound together by gossamer threads, the other parts remaining still green and forming a background against which the blackened masses sh
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 HERPOTRICHIA. 199 Herpotrichia nigra Hartig. This parasite is distinguished by its grey mycelium, which covers and completely envelops twigs and young plants. On the dwarf mountain pine it is not uncommon to find branches bearing patches of blackened needles closely bound together by gossamer threads, the other parts remaining still green and forming a background against which the blackened masses show up prominently (Fig. 89). Young spruce plants nnder a metre in height and the lower branches of taller trees are frequently completely enveloped in mycelium, and, where they have been pressed down to the ground by weiglit of snow, the twigs may be woven round and fastened to the earth by a felt of mycelium. Fifi. 90.—Herpotrichia nifira. a, hyphae weav- ing ii granular mycelium on the surface of the needle and forming tuber-like bodies over the stoniata ; rod-like haustoria are sunk into the outer walls of the epidermal cells. (After R. Hartig).
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