98 



MICROTHYRIALES 



(y) Spores dark 



m. Hypothecium hyaline; hj'menia irreg- 

 ularly disposed 

 (m) Paraphyses present 

 (n) Paraphyses lacking 

 n. Hypothecium carbonous, black; hy- 

 menia in a crown around a sterile 

 center; paraphyses present 

 z. Spores x-celled 



(x) Spores hyaline; paraphyses present 

 (y) Spores dark; paraphyses lacking 

 (c) Hymenia with separate scutella, in con- 

 centric rows; spores muriform, hya- 

 line; paraphyses present 



Palawania 24:414, TS ^12 

 Melanoplaca 24:414, TS 412 



Marchalia 24:406, TS 412 



Gilletiella 14:691, TS 413 

 Actinodothis 24:417, TS 413 



Pleostomella 24:418, TS 413 



Family 35. MICROTHYRIACEAE 

 2:658, 9:1053, 11:379, 14:686, 16:633, 17:861, 22:514, 24:393; TS 413 



Ascomata or apothecia superficial, without hypostroma, dimidiate with radiate 

 scutellum, round or linear, on a filamentous or membranous mycelium or subiculum, 

 or this lacking, ostiolate, laciniate, cleft or astomous; hymenium single, rarely sev- 

 eral and then somewhat loculoid; asci typically many, basal, parallel or convergent, 

 saccate to clavate, rarely cylindric; paraphyses lacking, or present and then some- 

 times forming an epithecium. 



A. Free mycelium none 



1. Scutellum with a single hymenium beneath 

 a. Ascoma rounded 



(1) Spores 1-celled, hyaline 



(a) Asci 8-spored 



X. Paraphyses present 

 y. Paraphyses lacking 



(b) Asci many-spored 



(2) Spores 2-celled 

 (a) Spores hyaline 



X. Ascoma setose; paraphyses lacking 

 y. Ascoma glabrous 

 (x) Lichenicole; paraphyses lacking 



Subfamily Microthyrieae 



Myiocoprum 2:659, TS 416 

 Peltella 24:423, TS 416 

 Myiocoprella 24:532 



Chaetothyriopsis 



Microthyris 



(y) Not lichenicole; paraphyses present Microthyrium 2:662, TS 416; 17 

 (b) Spores dark; paraphyses present Seynesia 2:668, TS 416; 17 



(3) Spores x-celled 



(a) Spores hyaline 



X. Ascoma more or less hairy; paraphyses 



lacking 

 y. Ascoma glabrous 

 (x) Paraphyses present 

 m. Scutellum dissolving at tip, then 



wholly 

 n. Scutellum persistent, usually ostiolate Phragmothryium 24:430, 



TS 416 

 (y) Paraphyses lacking; lichenicole Micropeltopsis 



(b) Spores dark; paraphyses lacking Halbania 24:420, TS 417 

 Ascoma linear 



(1) Spores 2-celled 



Caenothyrium 24:430, TS 417 



Actinomyxa 24:533 



