252 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^. 



formed by the prolongation of the anterior lip-cells, the posterior lips forming a usually angular, some- 

 times sharply pointed projection between them. Antheridia purplish, nearly straight or slightly curved, 

 rather abruptly enlarged below the sharply pointed apex, the venter somewhat inflated. Perithecia 

 80-100 X 25 p. Antheridia 35 X 7 p. Total length to tip of perithecia 200-225 X 100-115 p. 

 Appendages 35 fi. 



On PhUonthus flavolimbatus Erichs., Panama, British Museum, No. 750 (Biologia Coll.); Las Ve- 

 gas, Mexico,' Sharp Coll. No. 1130; P. parvimanus Sharp, Chontales, Nicaragua, British Museum, 

 No. 74G (Biologia Coll.); PhUonthus sp., Mt. Gay, Est Grenada, West Indies, British Museum, 489 

 (Smith Coll.); P. scybalarius Nord., British Museum, No. 406, Madeira, also Scotland, Sharp Coll. 

 No. 1126; P. longicornis Steph., British Museum, No. 408, Island of St. Helena, also Missouri, Sharp, 

 Coll., No. 1127; P. cruentatus Gmel., British Museum, No. 358, Europe; P. varians Peck, British Mu- 

 seum, No. 359, Ealing, England; PhUonthus sp. near mrians, Australia, Sharp Coll. 1128; Europe, Berlin 

 Mus., No. 821; P. dimidiatus Er., British Museum, No. 761, Netting Hill, England. On abdomen. A 

 form, apparently this species, also from Hong Kong, on PhUonthus sp., British Museum, No. 396, on 

 PhUonthus sp. near P. scybalarius Nord., Sydney, Australia, Sharp Collection, No. 1125 (very typical); 

 P. agilis Grav., Austria, Berlin Museum, No. 822; PhUonthus sp., Arabia, Sharp Coll., 1120; P. ebeneus, 

 Grav., Siberia, Sharp Coll., No. 1121; also Berlin Museum, No. 820, Europe; Phikmthus sp., Chile, 

 Berlin Museum, No. 817; P. bipustulatus Panz., Europe, Berlin Museum, No. 819. 



This common and widely distributed form, although it is in its typical form (Plate XXXI, fig. 5) 

 one of the best distinguished and most easily recognized species in the genus, varies very greatly in the 

 suffusion and development of its receptacle, which sometimes wholly lacks the black, fork-like upgrowths 

 so characteristic in the figure referred to. It is very often associated, also, with what appears almost 

 certainly to be a variety (fig. 9), that lacks the perithecial auricles and differs in its larger longer peri- 

 thecia, and usually in its larger, sometimes almost colorless, receptacle: such forms, though usually 

 shorter and stouter than the typical D. princeps, resembling this species very closely. A similar auricled 

 form has not, however, been found to accompany the typical D. princeps, and specimens of typical D. 

 vulgatus, from Europe, Australia (fig. 5) and North and South America, correspond in even the most 

 minute details. Its hosts are usually larger Philonthi on which it may occur in large quantities. The 

 species is closely allied to D. dubius. 



Dichomyces dubius Thaxter. Plate XXXII, figs. 7-10. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 426. April, 1900. 



Receptacle much as in D. princeps and similarly colored, smaller, shorter, and stouter, antheridia 

 large purplish; the distal tier of cells producing typically two, rarely more, perithecia, which are dull 

 brownish and dimorphous; usually rather slender, tapering slightly, the posterior lip-cells producing 

 ear-like outgrowths recurved or bent forward as in D. vulgatus: more rarely larger and stouter, the blunt, 

 often asymmetrical tip without appendages; the two forms sometimes, but not usually, associated on 

 the same individual: external appendages normally large, long, colorless, reaching to the middle of the 

 perithecium or even to its tip. Individuals asymmetrical, with a single antheridium and perithecia of 

 the second type, are not infrequently met with on the legs of the host. Perithecia 70-90 X 20 /<, those 

 without appendages 70-105 X 30-35 fi. Spores 35 X 4 p. Receptacle about 120 X 75 ft. Total 

 length to tip of perithecium average 190 //. 



On PhUonthus wneus Rossi, Niagara Falls, New York; Fresh Pond, Cambridge, Mass. 



This species was first observed on material sent me from Niagara Falls by Mr. Bullard, and I have 

 thus far seen it only on this host which is one of the largest species of PhUonthus in this region. Abun- 

 dant material has subsequently been obtained from Fresh Pond, near Cambridge, which, though usually 

 very constant, often includes individuals in which the perithecia are not auricled and which closely re- 

 semble forms of D. princeps and some of the forms of D. vulgatus which are without auricles. It is per- 



