THAXTER. — NEW LABOULBENIACEAE. 413 



25^. Receptacle about 45 x 12 p. Primary appendage 12 (i ; second- 

 ary appendages 35-40 p. Penetrating rhizoidal branches 150-184 x 

 10-12 (i. Total length to tip of perithecium 90-110 /<. 



On the inferior surface of the abdomen of a small fly. Raluuu, New 

 Pomerania. Berlin Museum, No. 1295. 



Dimeromyces crispatus nov. sp. 



Male Individual. Receptacle consisting of four superposed hyaline 

 cells, the basal one much longer than the rest combined ; the upper bear- 

 ing distally a two-celled terminal appendage, the lower cell of which is 

 small, the upper elongate, brownish ; the two remaining cells of the 

 receptacle producing each a single antheridium. Antheridia superposed, 

 the stalk-cell, neck, and venter well distinguished, the latter symmetri- 

 cally and considerably inflated, the neck slightly curved. Receptacle 

 50 X 8 fi. Antheridia 33 X 8-9 ^. Appendage 36 /x. 



Female Individual. Receptacle consisting of usually five superposed 

 cells, the basal cell very elongate, slender, and hyaline ; while of the four 

 remaining cells the two lower are much flattened, broader than long, and 

 separated by oblique septa, the two upper unlike and narrower. Of 

 these four cells the second from below gives rise to the stalk-cell of the 

 perithecium, while the others by successive proliferation produce each 

 a branch consisting of eight or ten obliquely superposed cells ; while each 

 of these cells in turn jaroduces a single simple branchlet from its upper 

 side, originally terminal, but becoming lateral through the further pro- 

 liferation of the cell which bears it; the branchlets distinguished by a 

 slight constriction and a broad dark septum at the base, brown, curved, 

 distally helicoid, slightly enlarged and paler. The primary terminal 

 appendage thus appears as the lowest of the upper series of branchlets, 

 from which it does not differ in structure. Perithecia one to three in 

 number, the first lowest, and always formed from the second from below 

 of the four distal cells of the receptacle, others sometimes arising from 

 each of the two upper distal cells ; the stalk hyaline, long and slender, the 

 venter small, narrow, not distinguished from the stalk, becoming brown- 

 ish, distally slightly inflated, the neck short and well but not abruptly 

 distinguished ; the tip well differentiated, hyaline, symmetrical or nearly 

 so, shovel shaped or spatulate, swollen at its base, and tapering to the 

 broad, bluntly rounded or nearly truncate apex. Spores about 30 X 

 3.5/,.. Perithecium : 70-75 x 18 ft , the stalk 50-125 x 15 ft. Recep- 

 tacle, basal cell 185-250 X 18 p, the distal portion about 50 jx. Total 



