Fungous Flora of the Soil 



499 



tudinal septa, the apical cell short or elongated into a straight, somewhat 

 hyaline beak. 



Hab. Fruiting freely in pure cultures; on dead leaves 

 and decaying vegetable matter of all kinds. Isolated from 

 soil of oat field and plant-breeding plats, Cornell University, 

 Ithaca, N. Y., by the writer. 



Alternaria humicola Oud., Arch. Neerl. Sci. Nat. ser. 



2, 7: 292. pi. 32, figs. 1-5. 1902. 



Colonies at maturity orbicular, black-green (Sacc. Chromot. 

 No. 34); fertile hyphee well developed, hyaline, articulate, 

 3-5iU in diameter, racemosely branched; conidia poly- 

 morphic, cylindrical, obclavate, oblong, lageniform, at first 



hyaline, later honey-colored, thin, dark, finally black-green Fig- i34- — 



iri-- -ii- * • z:i- Alternaria 



and luligmous, variable m size, maximum 10 by 50^1, 3-7 



fasciculata 

 Cooke & 

 Ellis. A, 

 conidiophore 

 and conidial 

 chain , x 

 236.6; B, 

 conidia en- 

 larged, X 

 533-3 



septate, muriform, in advanced age dense and very finely 

 roughened, slightly or nonconstricted at septa. 



Hab. Isolated from humous soil near Bussum, Holland, 

 March, 1901, Koning. 



Stilbaceae 



Stysanus difformis Oud., Arch. N^erl. Sci. Nat. ser. 2, 7: 

 296-297. pi. 2g, figs. 1-6. 1902. 



Creeping mycelium filamentous and hyaline; coremia gregarious, erect, 

 dark olive, 2.5 mm, high by i2o-2 20;u broad, with unequal wavy or often 

 flexuose surface, thickened toward the base, toward the top sometimes 

 producing a lateral branch, consisting of filiform, closely-united, septate 

 hyphc-e, which are intense avellanate in color; capitulum as regards form 

 comparable to a deformed pileus that is depressed and has its margin 

 repand or slightly incised, of the same color as the stipe, consisting of 

 slender, filifonn, fertile, septate, once- or twice-dichotomously-branched 

 hyphae, which are hyaline downward and avellanate olivaceous upward; 

 branches septate, at the top producing the conidia; conidia globose or 

 short elliptical, intense avellanate, 2.5-3/i in diameter, united in chains. 



Hab. Found on decaying wood from humous soil of forest of Spanders- 

 woud near Bussum, Holland, May, 1901, Koning. 



Tilachlidium humicola Oud., Arch. Neerl. Sci. Nat. ser. 2, 7: 297-298. 

 pi. 12, figs. 7-7. 1902. 



Tufts orbicular, snow-white, woody; primary threads ascending, cylin- 

 drical, 3 5-40iu thick, composed of very slender little fibrils (filaments) 

 that are articulate, hyaline, and closely united, surrounded on every side 

 by secondary basidiomorphic filaments; basidiomorphic filaments 40-80^1 

 high, diverging, simple, continuous, flexuose, arising from the primary 

 threads, subclavate; capitula of conidia globose, terminal, 15-18/1 in 



