MONOGRAPH OF THE LABOULBENI ACEJE. 



329 



Laboulbrnia parvula Thaxter. Plate XIV, figs. 22-24; Plate II, fig. 10. 



Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 41. 



Tinged with olive, becoming deep olive brown, sometimes nearly opaque. Perithccium 

 straight, inflated below the broad, squarish apex. Outer appendage almost opaque externally at 

 its base, consisting of a large basal cell producing distally two branches, one terminal, the other 

 lateral or sub-lateral, both once or twice branched above their basal cells ; inner appendage con- 

 sisting of a smaller basal cell which gives rise to typically two branches, each once or twice 

 branched, the ultimate branches in both appendages rigid, sub-cylindrical, erect or but slightly 

 divergent, slender. Receptacle stout, sub-triangular ; the basal cell small, hyaline or translucent, 

 the rest eventually nearly opaque, obscurely punctate. Spores, 40 x 4/x. Perithecia, 90-110 x 

 30-40 fi. Appendages, longest, 110-200 jjl. Total length to tip of perithecium, average, 180- 

 190 p. 



On Platynua extensicollis Say, P. ceruginosus Dej., P. striatopunctatus Dej., Maine to South 

 Carolina. On Bembidium bimaculatum Kirby, Washington (Miss Parker). 



This small and well defined species occurs often in great numbers on the legs (usually the 

 posterior) of its host, and not elsewhere. It was first sent me on P. extensicollis by Mr. 

 Pergande, and has since been found in various localities. The appendages are, as a rule, more or 

 less broken, and perfect specimens such as those represented in the figures are not frequently 

 met with. When uninjured, the slender, terminal portion of the appendages is quite character- 

 istic, but when the latter have been broken, as from the position of growth upon the host they 

 are very likely to have been, the new branches which grow out to replace the primary ones are 

 apt to be shorter, stouter, and without the characteristic form just mentioned. A curious 

 development of filaments from the basal cells of a perithecium which had been partly broken off 

 in an individual of this species, is represented in Plate II, fig. 10, and several similar instances 

 have been observed. 



Labodlbenia scelophila Thaxter. Plate XIV, figs. 23-26. 



Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 269. 



Becoming more or less suffused with olive-brown except the nearly hyaline basal cell. Peri- 

 thecium rather evenly inflated, the apex rather broad, the inner lip-cells prominent, bent slightly 

 outward. Outer appendage consisting of a sub-cylindrical basal cell, producing distally a termi- 

 nal and on its inner side a sub-terminal branch, the outer usually simple, the inner once 

 branched above its basal cell : inner appendage consisting of a somewhat smaller but similar 

 basal cell which produces two branches simple or once branched, bearing laterally several long, 

 slender, curved antheridia ; both appendages with their branches hardly divergent, sub-parallel 

 and curved strongly towards and past the tip of the perithecium. Receptacle sub-triangular, 

 short and rather stout, the partition between cells II and VI very oblique, the basal cell small, 

 sub-triangular, hyaline. Spores, 50 x 5 fi. Perithecia, 100-120 x 40-50 fi. Appendages, long- 

 est, 180 ft. Total length to tip of perithecium, 200-220 fx. 



On Platynus extensicollis Say, New England. 



