THAXTER. — MONOGRAPH OF THE LABOULBENIACE/E. 



127 



varying in length, consisting of perhaps eighteen to twenty cells, the basal cell and sometimes two or three 

 of those above it hyaline or nearly so, the rest indistinguishable, being concealed by the densely crowded 

 appressed appendages, which are rather short and slender, deep brown or opaque except along the inner 

 margin and at the tip; those around the base of the perithecium also densely crowded, subequal blunt- 

 tipped, wholly suffused, completely enveloping it and wholly concealing it till it is fully developed when 

 the tip alone projects beyond them. Spores about 35-40 X 3-4 /i. Perithecia 175 X 75 fi or smaller. 

 Total length to tip of perithecium 400-550 p. The longer appendages about 120 //.. 



On Colpodes agilis ('hand., British Museum (Biologia Coll.), No. 696, Jalapa, Mexico; on C. atratus 

 ('hand., British Museum (Biologia Coll.), No. 098, Irazu, Costa Rica; on Gynandropua Mexicanus 

 Putz., British Museum (Biologia Coll.), No. 682, Cordova, Mexico. Usually on legs. 



This species, which in general appearance suggests a young shoot of larch or spruce, owing to its 

 densely crowded appressed and undifferentiated appendages, is distinguished by its broad stout perithe- 

 cium, which is usually almost completely concealed by the somewhat longer appendages which arise about 

 its base, and by the enormous numbers of the latter which also render the main axis quite indistinguishable. 

 The only species with which it might be confused is R. Javanus in which, however, the appendages are 

 much less numerous. The individuals on Gynandropus (fig. 3) have been taken as the type, although 

 they do not appear to differ essentially from those on Colpodes. In fig. 9, Blate XLIV, the perithecium 

 has become visible owing to pressure of the cover glass. 



CLEMATOMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 439. April, 1900. 



Receptacle consisting of a basal and a subbasal cell from which arises distally a main axis bearing 

 a terminal perithecium and formed from a double row of cells; the cells of the external row producing 

 sterile appendages, those 6f the inner producing secondary axes similar in structure to the primary one, 

 or antheridial branches; the secondary axes producing antheridial or sterile branches on both sides, and 

 like the primary ones bearing a single terminal perithecium. The antheridia simple, borne singly, or 

 usually in whorls, from the distal end of the successive cells of the antheridial branchlet, which consists 

 of several superposed cells. 



The structure of the receptacle in this genus, although it suggests that of Distichomyce.i, is unlike 

 that of any other type, consisting as it does of two axes or cell-rows; an anterior (inner) bearing mostly 

 fertile branches, and a posterior bearing sterile appendages. The antheridial appendages which occur 

 both in the main anterior axis, and on its secondary branches, when the latter are well developed as in 

 fig. 2, recall the appendages of Arlhrorhynchus but they vary considerably both as regards the number of 

 cells which compose them and of antheridia which they bear. The wall-cells of the perithecia are more 

 numerous than usual, there being apparently seven in each row, although the lower apparent wall-cells 

 may prove to be upgrowths of the basal cells which function as wall-cells. The affinities of the genus are 

 doubtful and although the appendages are so similar to those of Arthrorhynchus the type may prove to be 

 more nearly related to Moschomyces and Compsomyces. 



Clematomyces Pinophili Thaxter. Plate XLIII, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 440. April, 1900. 



Nearly hyaline or yellowish, the basal and subbasal cells small, the cells of the main axis in six to 

 twelve pairs more or less alternate on either side, each cell of the outer series giving rise to a three- or four- 

 celled usually simple generally appressed sterile appendage, the terminal cell of which is often smoky 

 brown, its basal cell almost wholly united to the cell of the axis next above; the secondary axes one to 

 three in number, usually with a single basal cell, the external branches more often simple and sterile, the 

 inner fertile; the antheridial appendages of both primary and secondary axes more often simple, some- 

 times sparingly branched, those near the perithecia bearing the greatest number of antheridia which may 



