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 CHRYSOMYXA. 379 occurs on Ledum imludrc. It is difficult to distinguish from the preceding species, and causes the formation of similar aecidia on spruces in Northern Germany and other parts where Rhodo- dendron is not indigenous. Its uredospores are also capable of hibernating and of propagating the fungus where spruce is absent. Chr. himalayensis occurs on leaves of Rhododendron arhoreum in
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 CHRYSOMYXA. 379 occurs on Ledum imludrc. It is difficult to distinguish from the preceding species, and causes the formation of similar aecidia on spruces in Northern Germany and other parts where Rhodo- dendron is not indigenous. Its uredospores are also capable of hibernating and of propagating the fungus where spruce is absent. Chr. himalayensis occurs on leaves of Rhododendron arhoreum in tlie Himalaya. .MQlkm L. ¥i Fk;. 2\l.—Chriigomyxa rhodoclmdri. Teleuto- spore-sorus which has ruptured the lower epi- dermis of a leaf of Rhododendron hirsutum. The teleutospores are pluricellular, and one of them has germinated, giving a promycclium with .sterigniata, from which little sporidia are being abjointed. (After l)e Rary.) Fl<;. •2V2.—Chri/somi/xa rhododmdi-i on Spruce. The needles are beset with aecidia; discoloured jiarts of them are shown black, the normally green being left white, (v. Tubeuf dpl.) Chr. abietis (Wallr.).i Needle-rust of spruce. This is parasitic (•11 the spruce (Picea cxcclsa), and is found on the Alps up to an elevation of over 1700 metres. About the beginning of May the hibernating teleutospores produce promycelia and sporidia. The latter germinate at once, and the germ-tubes make their way through the epidermis into young unfolding needles. The mycelium is well-developed and lives inter- cellularly, sending haustoria into the host-cells; it contains yellow oil-drops, so that by the end of June needles contain- ing it exhibit yellow-coloured stripes. For the remainder of the year reddish-yellow elongated teleutospore-cushions are Reess, Botan. Zeitiutif, 1865; Die Ikostpilzfonnen cl. deulxrhen Conifireu, 1S69. Willkomm, Die mikrosropiwheu Feiude dcii Wa/des, 1868.
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