426 



THAXTER. MONOGRAPH OF THE LABOULBENIACEvE. 



Rhachomyces longissimus Thaxter. 

 Fine specimens of this species, which is the largest of the genus and may reach a length of almost 

 two millimeters, have been obtained in the British Museum on Colpodes evanescens Bates No. 694, Toto- 

 nicapan, Guatemala; on C. proteinus Bates, No. 699, Vera Paz, Guatemala; on C. reflexus Chaud., No. 

 1042 from Columbia. It shows a certain amount of variation in color, few specimens being as dark as 

 the one represented in my Monograph. The appendages also are often more widely separated from one 

 another, and the axis relatively stouter. It recalls R. Dolicaontis which, however, lacks the successive 

 pairs of divergent appendages which are so characteristic in this species as well as in R. tenuis, to which it 

 appears to be most nearly allied. 



Rhachomyces tenuis Thaxter. Plate XLIV, fig. 7. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 437. April, 1900. 



Perithecium relatively small, the lower half or more hidden by the appendages, hardly inflated, 

 faintly tinged with brown, tapering very slightly to the tip, which is suffused with dark brown, broad, 

 hardly differentiated and slightly asymmetrical. Receptacle very long and slender, the cells of the main 

 axis thirty to forty in number, dark reddish brown or nearly opaque, subhyaline below the somewhat 

 oblique septa, except the lower members of the series, which are as a rule wholly opaque; the cells in- 

 creasing slightly in size from the base upward. Appendages straight, narrower distally, rather short and 

 appressed, not very numerous; those about the base of the perithecium, about twelve in number, some- 

 what larger and longer than the rest, surrounding and concealing it more or less completely; some of the 

 lower appendages also longer and curved conspicuously outward, as are the antheridia. Perithecia about 

 110 X 30 fi. Longer appendages about 140-160 ft. Greatest width of receptacle about 20 fi. Total 

 length to tip of perithecium 800-1000 ft. 



On the legs of a small carabid beetle, Paris Museum, No. 113. Java. 



This elegantly formed species is distinguished from R. longissimus, which appears to be its nearest 

 ally, by its more slender form, its more slender and differently shaped perithecium and the character of 

 its appendages, which are quite different, although the same succession of projecting pairs occurs, the 

 members of which, unlike those of R. longissimus, are subulate and not recurved. 



Rhachomyces Javanicus Thaxter. Plate XLV, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XLI, p. 314. July, 1905. 



Perithecium straight, symmetrical, tapering slightly distally, translucent, brown, the tip opaque 

 blackish brown, the apex hyaline and blunt, the whole surrounded and more or less hidden up to the tip 

 by the appendages. Receptacle rather long and slender, the main axis normally consisting of more than 

 twenty cells which are clearly distinguishable, more or less suffused with blackish brown, less so toward 

 the base, more or less hyaline at, and obliquely below, the septa; the appendiculate cells giving rise to a 

 dense series of similar black subequal appendages, their inner edges somewhat hyaline, with slightly 

 upturned and enlarged bluntly pointed hyaline tips, more numerous distally and forming a dense tuft 

 below and around the perithecium which they conceal, except for its projecting tip. Perithecium 95- 

 110 X 35-40 fi. Receptacle 275-350 fi by about 18 fi. Total length 350-460 fi. Appendages, longer, 

 about 90-100 p. 



On legs of a small Harpaloid (?) beetle brought from Buitenzorg, Java, by Dr. H. M. Richards. 

 Closely allied to R. velatus, but differing in its smaller size more slender form and fewer stouter ap- 

 pendages, which do not conceal the axis as in velatus. 



Rhachomyces velatus Thaxter. Plate XLIV, fig. 9, XLV, fig. 3. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 435. April, 1900. 



Perithecium short stout straight symmetrical, evenly inflated, pale brownish, translucent; the tip 

 abruptly dark brown, opaque or nearly so, tapering symmetrically to the blunt rounded apex. Receptacle 



