398 



THAXTER. MONOGRAPH OF THE LABOTJLBENIACE.ZE. 



Laboulbenia bicolor nov. sp. Plate LXII, figs. 13-15. 



Perithecium free, subisodiametric throughout, or with a slight general inflation, rich dark clear brown 

 becoming almost opaque, often darker on the inner half, more or less granular; the granulation coarser 

 at the base: the tip short, abruptly distinguished, broad, suffused, the inner lip often more prominent and 

 hyaline: a clearly defined short hyaline stalk. Receptacle consisting of a contrasting hyaline basal cell 

 as long as the balance of the receptacle, or nearly equalling it in length : cell III extending upward beside 

 cell IV, its apex forming a prominence just below and external to the insertion-cell: cell II abruptly 

 narrower than cell I, which is prominent below it, especially on the posterior side, opaque, the opacity 

 involving finally cells II-VI, which usually remain more or less hyaline distally. Insertion-cell broad 

 and black, continuous with the opaque basal cell of the outer appendage, which forms a more or less 

 conspicuously developed upcurved external prominence, bearing the lower branch of the appendage, 

 which is further composed of three or four obliquely superposed cells each bearing a single simple branch : 

 the branches consisting of a basal and distal portion, the former two celled, the cells short inflated and 

 distinguished by suffused septa; the latter unicellular, or spuriously septate, tapering, faintly brownish, 

 or hyaline, mostly considerably shorter than the receptacle: the inner appendages consisting of a basal 

 cell wholly or only partly suffused, the rest of the appendage consisting of about four hyaline obliquely 

 superposed cells, bearing simple branches similar to those of the outer appendage; except that the basal 

 and subbasal cells give rise to short stalk-cells, with single terminal antheridia; the latter with rather long 

 curved slender necks, the base usually somewhat inflated, often broader than the stalk-cell, which is seated 

 on a blackened septum. Perithecia, exclusive of stalk (18 //), type-form 125-150 X 18-32 \l\ larger form 

 180-225 X 45 //. Receptacle, type-form 100-125 X 35-40 \l\ larger form 100 150 X 55-65 fi. Append- 

 ages 125-150 ji. Total length to tip of perithecium, type-form 275-300 //, larger form 325-400 fi. Spores 

 type-form 50 X 5 fi, larger form 65 X 6 /£. 



Type on a slender black Galerita, Paris Museum No. 73 Venezuela. Larger form on Galerita car- 

 bonaria Mannerh., Berlin Museum No. 960, Brazil. On the legs. 



I have considered the smaller and more slender form from Venezuela as representing the type of this 

 species (fig. 14), but although the Brazilian type presents constant differences in general size form and in 

 the detail of the appendages, I think it should not be separated, even as a variety. It is conspicuous for 

 the black and white effect of the contrasting regions of the perithecium and receptacle, which has suggested 

 the specific name. The suffused portions of the receptacle, before becoming opaque, are usually more 

 or less conspicuously mottled or punctate with darker flecks. 



Laboulbenia Colpodis Thaxter. Plate LXII, fig. 16. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 166. Dec, 1899. 



Perithecium wholly free, very large, uniform clear translucent brown, slightly inflated or the margins 

 straight, the basal wall-cells forming a well marked hyaline neck as broad as the base of the ascigerous 

 portion from which it is not abruptly distinguished; the tip rather narrow and well distinguished, darker, 

 the distinct lip-edges hyaline or translucent. Receptacle very small, cell I hyaline or yellowish, the rest 

 more or less deeply suffused with blackish brown becoming nearly opaque, especially cells III and IV, 

 which lie side by side and are about equal in size, cell III forming a rounded prominence just below the 

 outer edge of the insertion-cell, cell V triangular, about as large as cells III and V combined. Insertion- 

 cell very broad, thin, oblique not at first deeply blackened, but becoming indistinguishable in the general 

 blackish brown suffusion of the adjacent cells. Outer appendage consisting of a nearly erect series of 

 obliquely superposed small cells (sometimes as many as thirteen) at first hyaline, the basal cell and some- 

 times several of the cells above it becoming more or less suffused, each producing externally a single simple 

 branch, curved upward, its basal portion consisting of two cells, sometimes three, longer than broad and 

 more or less deeply suffused with brown, constricted at the dark septa; its distal portion elongate, reaching 

 nearly to the tip of the perithecium, strongly tapering, hyaline, except at its base where it is involved by 



