50 Mycologia 



Hypocrea perpusilla Montag. Hist. Phys. Polit, et Nat. I'ile 

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

 Sacc, Michelia 1:51. 1877. 



5. Nectria Fries, Summa Veg. Scand. 



387 (in part). 1849 



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

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

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



Plants parasitic or saprophytic; perithecia superficial, entirely 

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

 mon subiculum 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, i -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 subicu- 

 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). 

 Saprophytic on various substrata. 



Perithecia smooth or nearly so ; 



spores elliptical. i, A'^. Peziza. 



Perithecia covered with coarse 



granules ; spores fusoid. 2. A^. tremelloides. 



Parasitic on foliaceous lichens. 3. N. diplocarpa. 



Clothed with a dense covering of sulphur- 

 yellow hairs. 4. .V. fiavociiwra 

 Perithecia small, 100-150 mic. in diameter 

 (mostly less than 200). 

 Densely clothed with hyaline hairs (white 

 to the naked eye). 



