. Fio. 119.—Hiipodermella 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.) Fir,. 120.—Hypodenndla lands. Larch- needle with apothecia on the under side. A, Paraphyse, and an ascus containing four spores. B, Isolated (enlarged) asco- spore in its gelatinous coat. (v. Tubeuf del.) (66/u X 16yw) 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
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. Fio. 119.—Hiipodermella 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.) Fir, . 120.—Hypodenndla lands. Larch- needle with apothecia on the under side. A, Paraphyse, and an ascus containing four spores. B, Isolated (enlarged) asco- spore in its gelatinous coat. (v. Tubeuf del.) (66/u X 16yw) 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 U.S. America.) This disease of the Scots pine {Pimts sylvestris) is very injurious to young plants, especially those in nurseries. ^Hartig, Diseases of Trees, Eng. edit., 1894. Prantl, Flora, 1877; also, ForsUciss. Ctnlralhlatt, 1880.