THAXTER. — NEW LABOULBENIACEAE. 41 



perithecium 230-360//. Specimens on " Cyclothorax" and " Bembi- 

 dium " smaller. 



On Atelothrus erro Blk., Maui, No. 1230; A. gracilis Sharp, Lanai, 

 No. 1232 ; Disenochus sulcipennis Sharp, Kaui, No. 1219 ; Mauna 

 frigida Blk., Maui, No. 1221 ; Colpodiscus lucipete?is, Maui, No. 1217; 

 Colpocaccus Hawaiiensis Sharp, Hawaii, No. 1224 ; C. Lanaiensis 

 Sharp, Lanai, No. 1225; G. posticatus Sharp, Kaui, No. 1227; Meso- 

 thriseus muscicola Blk., Hawaii, No. 1237; M. tricolor Sharp, Molokai, 

 No. 1239; M. alternans Sharp, Kaui, Nos. 1220 and 1243. On the 

 following numbers in the Perkins Collection: Kaui, Nos. 1248, 1249, 

 1251, 1257, 1270; Maui, Nos. 1214, 1219, 1226, 1263, 1264, 1266, 

 1269, 1270, 1271; Molokai, Nos. 1250, 1267, 1272, 1274; Hawaii, 

 Nos. 1265, 1268. 



Laboulbenia Helluodis nov. sp. 



Perithecium becoming rich brown, free, usually somewhat broader dis- 

 tally, slightly inflated ; the distal wall-cells forming a clearly defined, 

 somewhat constricted, short neck ; the tip rather abruptly distinguished, 

 bent very slightly outward, opaque except the broadly hyaline or sub- 

 hyaline, flat-topped lips. Basal cell of receptacle hyaline or subhyaline, 

 inflated, broader than, and contrasting with, the opaque subbasal cell, 

 which is of about equal length and forms a constricted region ; the distal 

 portion of the receptacle small, rather abruptly broader, subsymmetfi- 

 cally triangular, the external margins even ; cells III, IV and VI sub- 

 equal, more or less deeply suffused with brown; cells III and IV more 

 deeply suffused externally, about half the upper margin of cell IV free 

 and forming a distinct prominence external to the jet black insertion- 

 cell ; cell V small and roundish. Appendages very similar to those of 

 L. Planetis ; the outer consisting of a divergent main axis of three 

 cells, broadly and deeply blackened externally and at the septa ; the 

 two lower bearing a single, usually simple, divergent branch distally 

 from the inner side ; the upper bearing two such branches terminally, 

 the outer deeply suffused with blackish brown, especially toward its 

 base, and directly continuous with the suffused portion of the main axis ; 

 the basal cell of the inner appendage half as large as that of the outer, 

 giving rise to a rather short simple branch on either side, or often itself 

 simple, bearing one or two solitary antheridia near its base. Spores 

 about 85x5/x. Perithecia 150-165 X 40-55 p including the stalk 

 (20 n). Receptacle 185-220 x 60^. Longest appendages 290 //.. Total 

 length to tip of perithecium 360 /x. 



On Helluodes Nebrioides Nietn., Ceylon ; Berlin Museum, No. 1050. 



