26 SPHAERIACEAE 



(b) Perithecia collapsing, becoming cup-shaped 

 x. Perithecia gregarious Coelosphaeria i: 91 



y. Perithecia cespitose Nitschkea 11: 272 



b. Asci many-spored Fracchiaea 1: 93 



2. Ostiole central, papillate Neoarcangelia 16: 419 



3. Ostiole lateral, conic Pleurostoma 1: 95 



II. Perithecia composite, typically in a stroma 



1. True stroma lacking; perithecia heaped together between bark and wood 



a. Asci 8-spored; ostiole short or long Calosphaeria 1:95 (16:419, 421) 



b. Asci many-spored; ostiole very short Coronophora 1: 103 



2. True stroma present ; perithecia immersed in bark or wood 

 a. Stroma formed by the changed matrix 



(1) Stroma valsous, i. e., perithecia in a circle 



(a) Asci 4-8-spored 



x. Perithecia usually 4, never more than 6, in each stroma 



Quaternaria 1 : 106 

 y. Perithecia man)-, 8-30, in most stromata at least 



(x) Perithecia circinate or monostichous, ostiole entire; asci subsessile. 



Valsa 1 : 108 

 (y) Perithecia monostichous or polystichous, ostiole not entire ; asci 

 stipitate Eutypella 1: 145, 17: 569 



(b) Asci many-spored Valsella 1: 158 



(2) Stroma eutypeous, i. e., broadly and indefinitely effuse 



(a) Asci 8-spored 



x. Stroma conspicuous, cortical or woody 



Eutypa 1:162, 17:569 

 y. Stroma more or less obsolete 



(x) Stroma woody; ostiole largish; spores subfuscous 



Endoxyla 1: 181 

 (y) Stroma cortical ; ostiole small ; spores subhyaline 



Cryptosphaeria 1:182 



(b) Asci many-spored 



x. Stroma manifest, cortical or woody 



Cryptovalsa 1: 187 

 y. Stroma obsolete, cortical Cryptosphaerella 1 : 186 



b. Stroma different from the substance of the matrix 



(1) Asci 8-spored; stroma effuse or disciform 



Diatrype 1:191, 9:480 



(2) Asci many-spored; stroma verruciform 



Diatrypella 1 : 200 



Hyalosporae 



1:407, A 58, 9:577. 11:289, 14:515. 16:45-'. 17:573 



Spores i-cellcd, hyaline or nearly hyaline, ovoid, oblong or fusoid, rarely 

 irregular or stellate, not allantoid. 



I. Perithecia single or separate 



1. Perithecia beaked or with a stellate ostiole 

 a. Perithecia subcarbonous 



