364 



MONOGRAPH OF TI1E LABOULBENIACEJE. 



the lack of any proper description, it seems superfluous to complicate the synonymy further, and 

 it must be confessed that Robin's figures, with their description, constitute quite as satisfactory 

 a basis for determination as is afforded in the case of many other species. 



CH^ETOMYCES Thaxter. Plate XI, figs. 20-22. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 178. 



Receptacle consisting of a slender rigid series of superposed cells from which arise suc- 

 cessively in a unilateral series the appendages, and one, rarely two, perithecia. Perithecium 

 flattened stalked. Appendages one from each cell, simple or branched, produced one or more 

 below the origin of the perithecium, the rest above it. Spores once-septate. 



This well-marked type differs from other genera, from the fact that as many as three of the 

 cells of the receptacle lying below the origin of the perithecia may give rise to appendages 

 apparently fertile. The lowest of the latter which form the series above the perithecium, also 

 seem to be fertile, producing a small number (one or two) of rather slender flask-shaped cells ; 

 but no discharge of antherozoids has been observed from them. The cells immediately above the 

 origin of the perithecia bear no appendages, but the lowest sometimes produces a second perithe- 

 cium. The perithecium appears to have four cells in each series of wall-cells, but it has not 

 been possible to determine this beyond question. 



Ch^etomyces Pinophili Thaxter. Plate XT, figs. 20-22. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 179. 



Perithecium suffused with purplish, more deeply at the base and along its inner half, long, 

 slender; the inner margin nearly straight, the outer curving inward_ distally to the prominent 

 somewhat angularly inflated tip ; the stalk-cells bent upward at the base, so that the axis of the 

 perithecium is nearly parallel to that of the receptacle, the lower short and narrow, the upper 

 becoming distally as broad as the perithecium, the basal cells of which are not distinguished 

 from it and are similarly suffused with purplish. Receptacle bristle-like, composed of about 

 fourteen superposed sub-cylindrical or somewhat flattened cells, almost or quite opaque and 

 indistinguishable, the series usually bent backward at the base and, more abruptly, at the apex. 

 Of these cells the three (rarely four) basal ones bear no appendages ; above these one to three 

 cells may bear fertile appendages, and are in turn succeeded by one, rarely two cells, from which 

 are produced single perithecia; above these follow two to four cells without appendages, while 

 the series is completed by five or six distal cells bearing short stout sparingly branched tapering 

 hyaline, mostly sterile appendages. Fertile appendages hyaline, sparingly branched, the anthe- 

 ridia irregularly placed. Spores very slender and sharply pointed, 37 x 1.5-2 fi. Perithecia 

 (including basal cells) 90-130 x 22 /j,; stalk-cells about 30 fi long by 18.5-22 fi distally, 11 ^ 

 wide at base. Total length of receptacle 150-165 x 7.5-8 p. Appendages (longer) about 

 50-60 



On Pinophilus latipes Er., Southern States. 



