. Comparative morphology of Fungi. Fungi. FUNGI IMPERFECT I 617 or its user. In this sense, it appears that Saccardo's system, as expanded by Lindau (1900, 1907-1910), by Allescher (1901-1903) and by Die- dicke (1915), serves all practical purposes. In Saccardo's system, the Hyphomycetes are classified in four sub- groups : in the Mucedineae and Dematieae the hyphae and conidiophores are always solitary, in the first, hyaline or brightly colored, in the latter, brown or black; in the Stilbeae the hyphae are united into coremia, and in the Tubercularieae to pulvinate stromata. Each of these sub


. Comparative morphology of Fungi. Fungi. FUNGI IMPERFECT I 617 or its user. In this sense, it appears that Saccardo's system, as expanded by Lindau (1900, 1907-1910), by Allescher (1901-1903) and by Die- dicke (1915), serves all practical purposes. In Saccardo's system, the Hyphomycetes are classified in four sub- groups : in the Mucedineae and Dematieae the hyphae and conidiophores are always solitary, in the first, hyaline or brightly colored, in the latter, brown or black; in the Stilbeae the hyphae are united into coremia, and in the Tubercularieae to pulvinate stromata. Each of these suborders is divided by spore characters: spores unicellular, Amerosporeae, , in the Mucedineae, Aspergillus (Fig. 110),Pem- cillium (Fig. 6), Monilia (Fig. 213) and Botrytis (Fig. 215); in the Dematieae, Thielaviopsis (conidia like Thielavia, Fig. 108); in the Stilbeae, Isaria (Fig. 167); in the Tubercularieae, Volutella (Fig. 405). Spores two-celled: Didymosporeae. Fig. 406.—Phoma apiicola. Pycnium on a root of celery. {After Klebahn.) {, Cladosporium); spores three or more celled: Phragmosporeae (, Fusarium, etc.). According to need in each of these groups, the hyaline and colored spore forms may be separated into special series, , the Amerosporeae into the Hyalosporeae and the Phaeosporeae, and the Didymoporeae into the Hyalodidymeae and Phaeodidymeae, etc. A similar classification may be made for the Melanconiales; , there are among the Melanconial Hyalosporeae, Sphacelia (Fig. 162, D) Gloeosporium (Fig. 183, b) and Collectotrichum, and in the Hyalodidymeae, Marssonina. In the Sphaeropsidales, four subgroups are first distinguished: the Sphaerioideae with black, membranous pycnia; the Nectrioideae with light-colored, fleshy pycnia; and the Leptostromataceae and Excipulaceae whose characteristics have been given above. The Hyalosporeae of the Sphaerioideae contain the Phyllosticta-Phoma group (Fig. 406); the Phaeosporeae, Coniothyrium; the Hyalodidymeae,


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