LEPTOSTROMACEAE 



189 



2. Pycnidia superficial, rostrate; conidia cuspidate 

 at both ends 

 B. Pycnidia with a stroma 



1. Stroma innate; folicole 



2. Stroma more or less erumpent; ramicole 



Mycorhynchus 18:418, H 155 



Polystigmina 3:622, H 327; 50 

 Chromocytospora 22:1147 



Family 82. LEPTOSTROMACEAE 



Pycnidia dimidiate, hemispheric, sometimes elongate and hysterioid, but typi- 

 cally with more or less radiate scutellum, membranous to carbonous, usually super- 

 ficial but often innate-erumpent, ostiolate or astomous, separate or with subicle or 

 stroma, typically dark; conidia and basidia various. 



The hysterioid genera of this family approach the similar types of Discellaceae 

 very closely, but they can be distinguished as a rule by the presence of a more or 

 less radiate scutellum. 



Hyalosporae 



3:625, 10:412, 11:553, 14:992, 16:986, 18:419, 22:1148 

 Conidia 1-celled, hyaline, globose to oblong 

 A. Pycnidia separate 



1. Pycnidia innate or erumpent 



a. Conidia catenate 



(1) Pycnidia stellately arranged; conidia glo- 



bose-ellipsoid 



(2) Pycnidia not stellate; conidia bacillar 



b. Conidia not catenate 



(1) Conidia ciliate at each end; ostiole none 



(2) Conidia not ciliate 



(a) Pycnidia opening by a cleft 

 X. Pycnidia oblong to elongate 

 y. Pycnidia rounded 



(b) Pycnidia ostiolate or astomous, but 



without a cleft 

 X. Pycnidia with several ostioles 

 y. Pycnidia with single ostiole or none 

 (x) Basidia ramose; conidia acropleurog- 



enous 

 (y) Basidia simple; conidia typically 



acrogenous 

 (z) Basidia none; conidia histogenic 



2. Pycnidia superficial 



a. Pycnidia bright-colored, fleshy: conidia cate- 



nate 



b. Pycnidia not bright or fleshy 



(1) Pycnidia stellate, rimose 



(2) Pycnidia not stellate 



(a) Conidia catenate 

 X. Basidia present 

 y. Basidia none 



(b) Conidia not catenate 

 X. Ostiole present, columellae absent; 



conidia lateral on bacillar basidia 

 y. Ostiole none; columellae present; co- 

 nidia on lageniform basidia 



Piggotia 3:636, H 228 

 Crandallia 14:998, H 221 



Tracyella 18:424, H 220 



Leptostroma 3:639, H 225; 51 

 Labrella 3:647 



Massalongina 



Pleurothyriella 



Leptothyrium 3:626, H 223; 51 

 Myxothyrium 



Creothyrium 

 Actinothecium 3:638, H 213 



Sirothyriella H 207 

 Sirothyriuin 



Acarella 

 Columnothyrium 



