258 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^E. 



size, brownish: upper tier .smaller, shorter, and narrower than the middle one, consisting of from thirteen 

 to fifteen hyaline cells: distally slightly concave, bearing a pair of perithecia, the appendages small, 

 hyaline. Perithecium large and stout, straight, faintly brownish, slightly inflated, tapering distally to the 

 nearly symmetrical truncate apex. Perithecia 120-135 X 30 ji. Length to the tip of perithecium 250 /«. 

 Greatest length of receptacle 140 X 75 fi. 



On elytra of Philonthus sp. indet. British Museum, No. 379. Angola, Africa. 



This species is characterized by the relatively small distal tier and well developed middle tier which, 

 however, produces no black fork-like prolongation, or a very short one. Although I should be at a loss 

 where to refer it, I should not, with my present knowledge of the genus, be inclined to describe it as 

 a distinct species without examining more material: yet it appears to differ from any forms with which 

 it might be confused, by the inconsiderable development of its upper tier. 



Dichomyces Cafianus Thaxter. Plate XXX, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 425. April, 1900. 



Tinged with dull amber-brownish throughout, the perithecia darker. Basal cell nearly hyaline, 

 the lower tier as in D. vulgatus, the opacity involving in general but half of the upper (external) cells, 

 the septa of which are visible on the inner side, the median cell dark brown, its lower half or more opaque : 

 the middle tier consisting of typically thirteen cells, the margins unmodified and ending in a short external 

 rounded projection, which does not extend beyond the base of the upper tier; the rather inconspicuous 

 antheridium normally placed, concolorous, a single short appendage close behind it: the upper tier con- 

 sisting of from nineteen to twenty-three, usually twenty-one, cells, forming an inverted crescent, the 

 short, stout, bladder-like appendages arranged as in D. vulgatus. Perithecia normally two in number, 

 somewhat inflated externally, nearly straight, slightly asymmetrical, rather stout, tapering to the bluntly 

 pointed undifferentiated tip. Spores 45 X 4.5 fi. Perithecia 120-140 X 35-40 fi. Receptacle 200- 

 250 X 100-140 ft. Total length to tip of perithecium 310-350 fi. Appendages about 20 X 6 fi. 



On Cafius puncticeps White, British Museum, No. 381. Colenso, Natal, Africa. 



This species is very similar to the variety of D. furdferus which is described under that species (Plate 

 XXXI, figs. 10-12), but is much larger than the largest individuals seen in the abundant material of this 

 form which has been examined. The perithecia are relatively smaller and the receptacle relatively larger, 

 especially the upper tier, which is more highly developed. The present species has an individuality 

 which it is hardly possible to describe, and although the two forms appear in general so closely allied 

 they are very readily distinguished when the actual specimens are compared. It must be admitted, 

 however, that the two may prove varieties of one species, although I am distinctly of opinion that they 

 should be kept distinct. 



Dichomyces exilis Thaxter. Plate XXXI, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 420. April, 1900. 



Basal cell hyaline. Median cell of lower tier deeply suffused with brown but not opaque; marginal 

 cells wholly opaque or translucent on the inner margins, extending upward so as to enclose the base of 

 the second tier; second tier consisting typically of thirteen cells, colorless or partly suffused with brownish, 

 the antheridia large brownish straight or slightly curved, the venter inflated, the cells external to them, 

 appendiculate, the outer three free above the marginal prolongation of the lower tier and forming a short 

 blunt projection on either side: upper tier like the middle one, mostly somewhat longer and narrower, 

 consisting of from thirteen to fifteen cells, the sub-median ones nearly triangular and for the most part 

 distally overlapped by the external cells next in order and the basal cells of the perithecia. Perithecia 

 typically two, pale brownish amber, long and narrow, slightly if at all inflated, tapering gradually to the 

 undifferentiated broad nearly truncate apex. Spores 35 X 4 fi. Perithecia 130-140 X 22 fi. Recepta- 

 cle 130-140 X 22 ju. Total length to tip of perithecium 250-275 p. 



On Philonthus xanthomcrus Kraatz., British Museum (Biologia Coll.), No. 751, San Andres, Vera 



