. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. MELAMPSORA. 367 The patches of Caeoma laricis Hartig.^ appear as golden-yellow cushions on the underside of the needles. The sporophores from which the aecidiospores are abjointed, form the centre of the patch, the periphery being occupied by numerous sterUe threads, which grow out as long paraphyses; it may so happen that the whole cushion consists only of these last. The formation of Gaeoma- patches is preceded by
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. MELAMPSORA. 367 The patches of Caeoma laricis Hartig.^ appear as golden-yellow cushions on the underside of the needles. The sporophores from which the aecidiospores are abjointed, form the centre of the patch, the periphery being occupied by numerous sterUe threads, which grow out as long paraphyses; it may so happen that the whole cushion consists only of these last. The formation of Gaeoma- patches is preceded by that of little pycnidia (spermogonia), which break out from under the cuticle. The mycelium lives intercellularly, and dies after the shedding of the Caeoma- spores. Melampsora betulina (Pers.) (Britain and America). Uredo- and teleutospores occur on the leaves of the birch {Betula alba). Plowright^ found from arti- ficial infection that this species produced Caeoma laricis on the needles of Larix europea. A second form of Caeoma laricis was obtained by Hartig, both from infec- tion by Mel. tremulae Tul. from the aspen, and by Mel. populina Jacq. from the black poplar. Pio. 199. _ Melampsora M. populina (Jacq.)« (Britain and ^™^ (Afte? America). Uredo- and teleutospores found ^uiasne.) on Populus nigra and P. ialsamifera. M. populina and M. tremulae are probably identical, for Hartig has found the same Melampsora on black and balsam poplars as on aspen, and in each case he produced Caeoma laricis by means of the uredospores. Schroeter states that the Melampsora of Populus nigra produces Caeoma allii of Allium. M. aecidioides D. C. (Britain). Uredo- and teleutospores on leaves of silver poplar (P. alba and P. canescens). Plow- right connects with it a caeoma-form on Mercurialis {Caeoma merourialis). Schroeter states that the Melampsora of Populus tremula produces Caeoma mercurialis. The Melampsorae of Willows were until recently grouped under a collectiv
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