. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 110 PHYCOMYCETES. and the formation of zoosporangia take place in the cells of the living host-plant. In addition, spores are formed which have a resting period. {B) Only one kind of spore is formed; it has a resting period, and only proceeds to produce sori of zoosporangia after decay of the host-plant. (a) Ghrysochytrmm: protoplasm contains a yellow oil. (b) Leucochytrium: protoplasm colourless. Each of these divi
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. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 110 PHYCOMYCETES. and the formation of zoosporangia take place in the cells of the living host-plant. In addition, spores are formed which have a resting period. {B) Only one kind of spore is formed; it has a resting period, and only proceeds to produce sori of zoosporangia after decay of the host-plant. (a) Ghrysochytrmm: protoplasm contains a yellow oil. (b) Leucochytrium: protoplasm colourless. Each of these divisions is sub-divided into forms with simple vesicles, and those with compound. Mesochytrium. Synchytrium (Pycnochytrium) succisae, De Bary and Wor.^ This parasite forms warty swellings and yellow spots, generally %. 0 -ft -â ^R'^r Fig. 2G.âSynchyti-ium succUae. A, A mature sporocarp inside its host-cell. £, In the upper part of the cell a sorus of swarm-sporangia after escaping frooa its covering, which lies below it. C, Isolated swarm-sporangium. D, Swarm- spores. (After Schroeter.) on the radical leaves and base of stem of Scahiosa succisa. Infection is brought about in damp situations by means of swarm-spores. These have a single cilium, and bore their way into the host-cell. ASter entrance, they produce a plasma-mass, which becomes enclosed in a delicate membrane. The cell so formed sprouts at its uppermost pole, and gives rise to a new spherical ceU, into which the older discharges itself. In the second cell numerous small sporangia are formed, so that it represents a sporangial sorus; beside it is always found the empty membrane of the first cell. The sorus breaks up later into single sporangia, which on opening, set free their contents ^Schroeter, " Pflanzenparasiten aus d. Gattung Synchytrium.'' Cohn's Beitr, ;. Biolog. d. Pflanzen, 1875.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability