396 



THAXTER. 



MONOGRAPH OF THE LABOTJLBENIACEjE. 



Paboulbenia fusiformis Thaxter. Plate LXIV, fig. 4. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 39. June, 1002. 

 Perithecium relatively long and slender, becoming nearly opaque and marked by scattered blackish 

 points more conspicuous near the base, sometimes nearly obsolete, erect, or slightly divergent above the 

 stalk, straight, subfusiform; the basal wall-cells forming a short hyaline stalk; the tip often rather 

 abruptly differentiated, darker, often curved outward; the lips suffused, or the edges hyaline. Receptacle 

 very long and slender; the basal cell short, nearly hyaline; the rest pale dull brownish, indistinctly trans- 

 versely striate-punctate ; cell II very long, isodiametric, throughout, except where its distal end is obliquely 

 overlapped for a short distance by cell VI, separated by a short horizontal septum from cell III, which is 

 much elongated and is separated from cell IV by an oblique septum, above which the receptacle shows 

 a slight but abrupt contraction in diameter; cell IV more than twice as long as cell V. Insertion-cell 

 black and thick, the blackening involving the greater portion of the basal cell of the outer appendage. 

 Appendages very similar to those of L. perplexa, the basal cells of the branches somewhat darker, the 

 distal part somew hat shorter. Spores 90 X 7 ;i. Perithecia 450-580 X 60-75 n including stalk (40 n). 

 Receptacle 500 ;i to over 1 mm. X 70-75 /i. Appendages 275-375 /(. Total length to tip of perithecium 



I. 65 mm. 



On the inferior surface of the prothorax of Galerita carbonaria Mannerh., Brazil; Berlin Museum, 

 No. 960. 



This species is so large that it has been necessary to reduce to X 150 the magnification (X 260) 

 used in figuring its allies. Although apparently so well distinguished, especially by its very peculiar, 

 usually distinctly punctate, perithecium, I feel uncertain whether it may not possibly prove no more than 

 a variety of L. perplexa, brought about, perhaps, by more abundant nutrition, afforded by its position of 

 growth on the host. It was found associated with L. perplexa, L. ineerta, L. cornicvJaia, and L. birolor 

 on the same individual. 



Laboulbenia perplexa Thaxter. Plate LXIII, fig. IS. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 49. June, 1902. 



Perithecium very large and long, not twice as long as the receptacle, dull translucent olive-brown, 

 or becoming blackish brown, straight, usually erect, nearly isodiametric, or often subclavate, tapering 

 slightly below to a short rather narrow hyaline contrasting stalk formed by the basal wall-cells; the sub- 

 basal wall-cells slightly spiral, making from one quarter to one half a turn; the tip short, blunt, blackish, 

 generally not well distinguished, sometimes bent rather abruptly inward. Receptacle short, the basal 

 cell nearly hyaline, somewhat elongate, the rest of the receptacle hardly exceeding it in length, dirty olive 

 brown, becoming more deeply suffused with brown or blackish brown and somewhat mottled; cell II 

 small, separated from cells III and VI by very oblique septa, its lower third or fourth, only, free; cells 



II, III, VI and often IV not differing greatly in size, their inner angles often converging to a common 

 point at about the centre of the distal portion of the receptacle; cell III triangular or subtriangular, ex- 

 tending upward to a point just below the insertion-cell, and downward often nearly to the base of cell 

 II; cell V but slightly smaller than cell IV. Insertion-cell slightly oblique, well defined, rather thick, 

 broad, black. Appendages corresponding in type to those of L. Galeriice, hyaline, or the lover cells be- 

 coming suffused more or less, but not deeply, with brown; the outer and inner free above the base, usually 

 divergent; the outer consisting of from six to sometimes ten or more obliquely superposed cells each of 

 which bears externally a simple branch consisting of a two-celled basal part, the cells slightly longer than 

 broad, constricted at the dark septa, clear brown; the distal part long, becoming slender, flexuous and 

 hyaline toward its extremity, which may reach, or even exceed, the tip of the perithecium. The basal 

 cell of the inner appendage producing a free branch on either side similar to the outer appendage, and 

 bearing similar branchlets; except that the lowest, and usually the next above it, consist of single cells 

 bearing terminally single brownish slightly curved antheridia. Spores 90 X 7 ft. Perithecia 290-360 



