422 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^E. 



Closely allied to R. Thalpii, but larger, with longer and more numerous appendages which nearly 

 conceal the perithecium. The septa of the axis are usually more or less deeply suffused. In one specimen 

 these suffusions above form black bands, but the region is not visible in a majority of the specimens, being 

 hidden by the appendages. 



Rhachomyces pilosellus (Robin) Thaxter. 

 Scanty material of this species in poor condition was found in the Paris Collection, No. 17G on Lathor- 

 bium fulmpenne Fab. from Fiance, and also on the same host var. apteraum in the Berlin collection 

 from Europe. The specimens appear to correspond in all respects with those previously examined. 



Rhachomyces Aph^nopsis Thaxter. Plate XLV, figs. 12-14. 

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



Perithecium but slightly inflated, hyaline, straight, the tip blunt symmetrical. Receptacle variable, 

 hyaline; the main axis consisting of about ten to fifteen hyaline cells, the two lowest larger and suffused 

 w T ith brown, (he rest broader than long, and separated by somewhat oblique septa; the hyaline appendic- 

 ulate cells relatively large, and not concealed by the appendages, which are rich black brown, the lower 

 ones, when unbroken, extending upward far beyond the tip of the perithecium and curved toward it: 

 those arising about its base, and even below it from the inner cells of the appendiculate series, unlike the 

 rest, erect, straight, consisting of a paler basal part, five to six septate, with constrictions at the septa, and 

 a distal unicellular more or less elongate portion. Perithecium (not fully matured) about 85 X 25 fi. 

 Receptacle 75-165 X 15-18 ;i. The longest appendages about 300-350 /(. 



On the elytra of Aphcenops cerberus Diek., Ariege, France; Sharp Collection, Type, No. 1142; Berlin 

 Museum, No. 877; Paris Museum, No. 193. 



I have found a few specimens of this species in all the collections mentioned, but none are fully 

 matured and only the two figured have perithecia. The species is well characterized by the closely septate 

 appendages about the base of the perithecium, and the long clear rich dark brown appendages of the 

 usual type which arise from the axis and are as long near its base as near its summit. The species is most 

 nearly allied to R. hypogasus and all the specimens infested appear to have come from the same locality. 



Rhachomyces hypoceus Thaxter. 

 Single preparations of this species have been obtained from the Hope Collection, No. 304 on Anoph- 

 thalmus obhngus Motsch, Carniola, and from the Berlin Museum on A. Bilimeki Sturm, from the Adela- 

 burg Grotto, No. 872: both, however, immature. Several small forms which are perhaps undeveloped 

 individuals of this species were also found in the Paris Museum on A. hirtus Sturm., No. 192, and Anoph- 

 thalmus "n. s." 



Rhachomyces stipitatus Thaxter. Plate XLIV, figs. 5-6. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 438. April, 1900. 



Perithecium pale straw-colored becoming tinged with brownish, much darker toward the tip; broadly 

 subfusiform, usually symmetrical, tapering from about the middle to the small blunt usually symmetrical, 

 hardly differentiated, often hyaline tip; borne free on a stalk-cell which is concolorous, sometimes as long 

 as the receptacle, in other cases but slightly developed. Receptacle straw-colored, or faintly brownish 

 with pale "stigmatal" marks; the main axis consisting of about fifteen to seventeen cells, the septa rather 

 oblique, its distal portion, consisting of about two to four cells, erect and free: the cells of the secondary 

 axis relatively large, concolorous, that opposite the subbasal cell of the main axis bearing a long opaque 

 blackish brown appendage curved toward the receptacle and often equalling it in length, other similar 

 appendages arising at intervals above it but not from all the lower cells, becoming more numerous through- 

 out the distal half and in some instances extending to or beyond the tip of the perithecium even in the long- 

 stalked forms, associated throughout with shorter appendages and antheridia. Some of the individuals 



