. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 416 UKEDINEAE. P. Ravenelii Thiim. On Piiitts aitstralis in North America (probably a variety of P. oblongisporium). P. deformans Mayr. On Pinus mitis in America. P. giganteum (Mayr). On Pimts deiuijlora and P. Thunhergii in Japan. This causes very conspicuous deformation of its host (Figs. 249 and 250). P. complanatum Barcl. On Pinus longifolia in India. The following species frequent other hosts: Peridermium conon
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 416 UKEDINEAE. P. Ravenelii Thiim. On Piiitts aitstralis in North America (probably a variety of P. oblongisporium). P. deformans Mayr. On Pinus mitis in America. P. giganteum (Mayr). On Pimts deiuijlora and P. Thunhergii in Japan. This causes very conspicuous deformation of its host (Figs. 249 and 250). P. complanatum Barcl. On Pinus longifolia in India. The following species frequent other hosts: Peridermium cononim Thiim.^ This aecidium first found by De Bary in Thliringia, has recently been reported in Denmark, Russia, and America; also in Upper Bavaria by v. Tubeuf in September, 1895. It takes the form of two large aeeidia, 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 aeeidia contain a very large quantity of starch. Tel- eutospores of the species are unknown. Peridermium coruscans Fries.^ 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 aeeidia 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 jp^- J>er Fig. 261.—.(iccidiMJw conoi-um-picene. ^je-r, Peri- dium; sp, spore; 2w, intermediate cells; spti; sporophore; hi, mycelium ; pros, prosenchynia. (After Reess.) 'Reess, Sostpilzformen, 1869. ^Rostrup, Vidensk. Gelnk. Forhandl., Please note that these images are extracted from scanned page imag
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