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, 

 e.g., 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.) 



{e.g., Cladosporium); spores three or more celled: Phragmosporeae (e.g., 

 Fusarium, etc.). According to need in each of these groups, the hyaline 

 and colored spore forms may be separated into special series, e.g., 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; e.g., 

 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, Ascochyta; the Scole- 

 cosporeae (spores multicellular, slender), Septoria (Fig. 8), and in the 

 Excipulaceae, Discula (Fig. 183, d) is an example of the Hyalosporeae. 



Naturally it would be desirable to have the Fungi Imperfecti entirely 

 disappear as a group, and be distributed among the natural orders of 

 fungi. It will be generations, however, before this hope will be realized. 



