. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 416 UREDINEAE. P. Ravenelii Tliiuu. On Finns (V'stroh's m North America (probably a variety of /'. ohloagisporium). P. deformans Mayr. On Pinns mitix in America. P. giganteum (Mayr). On IHnus densifloru &\u\ P. T/tunberr/ii iu Japan. Tliis causes ver\' conspicuous deformation of its host (Figs. 249 and 250). P. complanatum PJarcl. On Finns longifolia in India. The following species fre(|iie
. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. 416 UREDINEAE. P. Ravenelii Tliiuu. On Finns (V'stroh's m North America (probably a variety of /'. ohloagisporium). P. deformans Mayr. On Pinns mitix in America. P. giganteum (Mayr). On IHnus densifloru &\u\ P. T/tunberr/ii iu Japan. Tliis causes ver\' conspicuous deformation of its host (Figs. 249 and 250). P. complanatum PJarcl. On Finns longifolia in India. The following species fre(|iieiit other hosts: Peridermium conorum Thiini.^ This aeciclium first found by I)e Jiary in Thuriugia, has recently been reported in Denmark, liussia, and America; also in Upper Bavaria by v. Tubeuf in September, 1895. It takes the form of two large aecidia, which make their appearance on the outer or inner side of the cone-scales of spruce. The white peridia break through the epidermal tissues which then remain as a brownish sheath around each ruptured peridium (Fig. 251). The spores are separated by inter- mediate cells, and their outer coats are studded with poly- gonal warts. The cone-scales bearing aecidia contain a very large quantity of starch. Tel- eutospores of the species are unknown. Peridermmm coruscans The mycelium of this fungus seems to perennate in twigs and buds of spruce. Twigs unfold from the bud as deformed, shortened, cone-like shoots bearing very short broad needles of a pale colour. The aecidia are produced on the deformed needles as broad lineal cushions with white peridia. They originate under the epidermis which they rupture, and break out on one side of the needle. ^Reess, Rostpihformtn, 1869. ^Rostrup, Vicleud: Gehl: ForlmmlL, ^er Fig. 251.—Accidium conorum-picetie. per, Peri- dium ; sp, spore; :w, intermediate cells ; spt,\ sporophore ; m, naycelluni; pros, iirosenchyma. (After Reess.). Please note that these images are extracted from
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
