50 



Mycologia 



Hypocrea perpusilla Montag. Hist. Phys. Polit, et Nat. Tile 

 de Cuba. PI. Cell. 335. 1838. Nectriella perpusilla (Montag.) 

 Sacc, Michelia 1 : 51. 1877. 



Nectria Fries, Syst. Orbs. Veg. 105 (as possible genus). 1825. 

 Dialonectria Sacc. (as subgenus) Syll. Fung. 2: 490. 1883. 

 Dialonectria (Sacc.) Cooke, Grevillea 12: 77. 1884. 



Plants parasitic or saprophytic; perithecia superficial, entirely 

 free, scattered or occasionally crowded, without stroma or com- 

 mon subieulum but individual perithecia often surrounded near 

 the base by a scant mycelial growth, globose, ovate or conical in 

 form; perithecial wall composed of distinct coarse cells or cell 

 structure obscure, smooth, pruinose, furfuraceous, clothed with 

 deciduous or well-developed, flexuose or bristly hairs ; ostiola 

 papilliform, obtuse, or obscure; color from whitish to yel- 

 low, orange or blood-red to reddish-purple, varying much in a 

 given species according to age and conditions ; asci cylindrical or 

 clavate, mostly 8-spored; spores hyaline, 1 -septate, elliptical, 

 fusoid or fusiform, constricted or non-constricted at the septum; 

 paraphyses often present but delicate and indistinct. 



Type species : Sphaeria Peziza Tode. 



The genus as treated here is used in its restricted sense to 

 include only those forms in which stroma and a common subieu- 

 lum are entirely wanting. 



Perithecia pale, ranging in color from orange to 

 sulphur-yellow or whitish. 

 Perithecia large, 250-300 mic. in diameter 

 (mostly 300). 

 Naked or nearly so (occasionally clothed 

 with deciduous mycelial threads). 



5. Nectria Fries, Summa Veg. Scand. 

 387 (in part). 1849 



Saprophytic on various substrata. 



Perithecia smooth or nearly so ; 



spores elliptical. 

 Perithecia covered with coarse 

 granules ; spores fusoid. 

 Parasitic on foliaceous lichens. 

 Clothed with a dense covering of sulphur- 

 yellow hairs. 

 Perithecia small, 100-150 mic. in diameter 

 (mostly less than 200). 

 Densely clothed with hyaline hairs (white 

 to the naked eye). 



4. N. flavociliata. 



2. N. tremelloides. 



3. N. diplocarpu. 



1. N. Peziza. 



