. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. GYMNOSPORANGIUM. 403 G. globosum Farl. Aecidia on Pz/rus Mains, P. communis, i'ljihyaia cuhjaris, Sorhus americana, and species of Crataegus. G. nidus-avis Thaxt. Aecidia and pycnidia on Pyrus Mains, Amclanchier canadensis, and Cydouia vulgaris. On the red cedar it causes the " bird's nest" deformation of the branch-system. G, speciosum Peck. On Junipenis â oecidcntalis. G. Cunninghamianum ]jarcl. On Cyprcss
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. GYMNOSPORANGIUM. 403 G. globosum Farl. Aecidia on Pz/rus Mains, P. communis, i'ljihyaia cuhjaris, Sorhus americana, and species of Crataegus. G. nidus-avis Thaxt. Aecidia and pycnidia on Pyrus Mains, Amclanchier canadensis, and Cydouia vulgaris. On the red cedar it causes the " bird's nest" deformation of the branch-system. G, speciosum Peck. On Junipenis â oecidcntalis. G. Cunninghamianum ]jarcl. On Cyprcssus turulusa in the Himalaya. Aecidia on Pyrus Pashia. The following genera do not occur in Europe. Colcopuccinia, Bavenclia, AJcrolar ia, Ti â h-h ospo)'a. Ravenelia alone amongst these â contains parasitic species of import- ance. They all occur on Leguminosae and Euphorbiaceae in the warmer parts of India, Africa, and America.^ Ravenelia Volkensii Henn. has teleutospore-sori which appear on " witches' broom " deformations of the twigs of an Acacia in Usambara. Rav. pymaea Lager, et Diet, produces its teleutospores on malformed branches of Phyllanthus in»'Ecuador. Certain forms of Aecidinm which cause deformation of species of Acacia should probably be included in this genus (see p. 410).. Fig. 240.âCedar Appks caused liy GJ/iiinoyiorangii'.m maci-opus. (v. Tubeuf del.) Endophyllum. Teleutospores originate serially on cushions which are enclosed in a peridium similar to aecidia ; on germination, a four-celled promycelium is Leaves of Euphorlia, Scdum, or Scmpcrvivuni inhabited by mycelium develop abnormally. Endophyllum euphorbiae-silvaticae (D. C.) (Britain). Accord- ing to Winter, the peridia are regularly distributed over the underside of the leaf of Eupliorliia amygdcdoidcs; they have white fissured margins either erect or somewhat turned liack. ^Dietel, "The Geuiis Ravenelia," Hedwvjia, 1894. - The teleutospores of this genus might be
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