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 /x ; conidia ovate-oblong, ends obtuse, 

 almost straight, typically 2-septate, 24-36x10-12 /x, 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. Re7id. de PAcad. 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 /x, 

 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 /x, rarely as much as i /x diam., curving 

 irregularly, septate or pseudoseptate, branching; aerial 

 hyphae at first white, then greyish, evanescent, breaking 



2 E 



