^6 SPHAERIACEAE 



(b) Perithecia collapsing, becoming cup-shaped 



X. Perithecia gregarious Coelosphaeria i: 91 



y. Perithecia cespitose Nitschkea 11: 272 



b. Asci many-spored Fracchiaea i: 93 



2. Ostiole central, papillate Neoarcangelia 16: 419 



3. Ostiole lateral, conic Pleurostoma i : 95 

 II. Perithecia composite, typically in a stroma 



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



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



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



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



a. Stroma formed by the changed matrix 



(i) 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 i: 106 

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



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



Valsa i: 108 

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

 stipitate Eutypella i: 145, 17: 569 



(b) Asci many-spored Valsella i: 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 i : 182 



(b) Asci many-spored 



X. Stroma manifest, cortical or woody 



Cryptovalsa i: 187 

 y. Stroma obsolete, cortical Cryptosphaerella i: 186 



b. Stroma different from the substance of the matrix 

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



Diatrype 1:191, 9:480 

 (2) Asci many-spored; stroma verruciform 



Diatrypella i: 200 



Hyalosporae 



1:407, A 58, 9:577, 11:289, 14:515, 16:452, 17:573 



Spores l-celled, hyaline or nearly hyaline, ovoid, oblong or fusoid, rarely 

 irregular or stellate, not allantoid. 



I. Perithecia single or separate 

 I. Perithecia beaked or with a stellate ostiole 

 a. Perithecia subcarbonous 



