HYPHOMYCETACEAE 433 



ruptured periderm, 1-2 mm. long, 0-3 mm. wide, brown, 

 stromatic base white, producing on its surface the crowded, 

 parallel, cylindrical with inflated base, hyaline conidio- 

 phores 30-35x6-7 ju; conidia ovate-oblong, ends obtuse, 

 almost straight, typically 2-septate, 24-36x10-12 fi, sub- 

 hyaline. 



HYPHOMYCETACEAE 



Superficial or subsuperficial, rarely endoparasitic on 

 insects; hyphae often profuse, bearing naked, free conidia; 

 asci, perithecia, and ascophore absent. 



Mostly representing phases in the life-cycle of higher 

 fungi. 



Mucedineae. — Hyphae and conidia hyaline or clear- 

 coloured ; not brown or blackish. 



Oospora, Wallr. — Tufts delicate, effused or pulvinate, 

 lax or rather compact ; fertile hyphae short, slender, simple, 

 or sparingly branched; conidia concatenate, globose or 

 elliptical, colourless or clear-coloured. 



Oospora abietum, Oud., Ct. Rend, de I'Acad. Roy. d. Sc, 

 des Pays-Bas, seance de Jan. 1897. — Tufts minute, sub- 

 pulvinate, forming lines on the leaf near the nerve, 

 emerging from the stomata; conidiophores short, simple; 

 conidia elliptical, ends rounded, continuous, 10-12X6-7 ft., 

 caducous. 



Oospora scabies, Thaxter, Ann. Rep. Conn. Agric. Expt. 

 Station, 1891, p. 152. — Vegetative hyphae hyaline or 

 brownish from the general discoloration of the sub- 

 stratum, •4-'6 /i, rarely as much as i /u. diam., curving 

 irregularly, septate or pseudoseptate, branching ; aerial 

 hyphae at first white, then greyish^ evanescent, breaking 



2 E 



