. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. HYPODERMELLA. 235 apothecia were present on the upper surface of the needles as isolated black spots or united into lines; they dehisce by an elongated fissure. The asci are cylindrical with rounded apices, and measure about 110m in length; they are almost sessile. Each contained four hyaline, unicellular, club-shaped spores ii\. Fic. 119.—Hypodermella sulcigena. The apothecia form black lines on the needles. Ascus
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. HYPODERMELLA. 235 apothecia were present on the upper surface of the needles as isolated black spots or united into lines; they dehisce by an elongated fissure. The asci are cylindrical with rounded apices, and measure about 110m in length; they are almost sessile. Each contained four hyaline, unicellular, club-shaped spores ii\. Fic. 119.—Hypodermella sulcigena. The apothecia form black lines on the needles. Ascus containing four spores (enlarged). Single spore with a gelatinous covering (still further enlarged). (Cop. from Rostrup.) Fig. 120.—ffypodennella laricis. Larch- needle -with apothecia on the under side. Af Paraphyse, and an ascus containing four spores. B, Isolated (enlarged) asco- spore in its gelatinous coat. (v. Tuheuf del.) (66 m X 16/u) with a gelatinous membrane. The paraphyses are simple hyaline filaments, shorter than the asci. Lophodermium. The oblong apothecia are embedded in the host-tissues under a thin black cover, which breaks by a long fissure. The club- shaped asci contain thread-like unicellular spores, with a mucilaginous membrane. The paraphyses are sometimes septate and furnished with hooked or button-shaped ends. The spores reach maturity on killed portions of plants, and are forcibly ejaculated. The formation of pycnidia (spermogonia) precedes that of apothecia. Many members of this genus are destructive enemies of plants. Lophodermium pinastri (Schrad.).^ Pine-blight or needle- cast. (Britain and America.) This disease of the Scots pine (Pimis sylvestris) is very injurious to young plants, especially those in nurseries. 'Hartig, Diseases of Trees, Evig. edit., 1894. Prantl, Flora, 1877; also, Forstwiss. Cenlralblatt, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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