338 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



basal cell similar to that of the outer, and producing on cither side a straight hyaline erect branch. Spores 

 50 X 4 ii. Perithecia 130 140 X 30-35 /i exclusive of the variably developed neck, which may be 18 fi 

 long. Total length- to tip of peritheeium 260 ft; to insertion-cell 100//; width 40 fi. Longer appendages 

 200-270 (i. 



On margin of elytra of Orthomus (Argutor) aquilus Coquer, Algeria, Paris Museum, No. 41. 



The typical form of this species, which is represented in fig. 14, is a clearly defined and readily recog- 

 nizable type; yet among the individuals examined with which this type form was associated, are several 

 variations, notably the elongate form represented in fig. 15, which measures about 380 /i to the tip of the 

 peritheeium, lacks the well defined hyaline neck at the base of the latter, and in which the elongate recep- 

 tacle is dirty brownish yellow, with olive shades, only, in the distal region. The outer appendages are 

 normally simple, and where branches occur, they appear always to have arisen as the result of injury. 



Laboulbenia Dryptje Thaxter. Plate LIV, fig. 19. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 35. June, 1902. 



Peritheeium usually nearly straight, often nearly symmetrical, the region corresponding to the basal 

 wall-cells usually distinctly differentiated, hyaline or transparent, brownish, becoming darker in older 

 individuals, concolorous with the basal and other cells below; but in general contrasting strongly, 

 but not abruptly, w T ith the rich dark brown of the rest of the peritheeium above it, which may become 

 opaque; the tip often bent slightly outward, not abruptly distinguished; the inner lip-cells more promi- 

 nent and deeply suffused, except the edges. Receptacle rather short, punctate, becoming more or less 

 and rather irregularly stained with brown, often blackish along the posterior margin up to the insertion- 

 cell, which is thick, well defined, contrasting. The appendages rather slender; the outer nearly straight 

 in normal individuals, simple, divergent, rigid, tapering; the basal cell more than twice as broad, subhya- 

 line, with brownish suffusions next its deep black contrasting outer wall, the opacity sometimes involving 

 the subbasal cell, which is similar and similarly blackened externally, as is the cell next above: the inner 

 appendage simple, or more often once branched above the subbasal cell, divergent like the outer, brown- 

 ish yellow, the antheridia borne singly from the lower cells. Perithecia 110-150 X 35-40 \i. Receptacle 

 135-180 ji. Longer appendages 220 p.. Total length to tip of peritheeium 220-250 /«. 



On Drypta ruficollis Dej., Natal, Africa; British Museum, No. 506. 



This species is perhaps as closely allied to L. Orthomi as to any other, and is distinguished from the 

 fact that the basal cells of the peritheeium form an enlargement below the latter, rather than a more 

 slender neck. The form and relative size of the peritheeium are also different. 



Laboulbenia melanaria Thaxter. Plate LIV, fig. 18. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 186. Dec, 1899. 



Peritheeium nearly free, uniformly suffused with clear blackish brown, straight or bent slightly out- 

 ward; the tip more deeply colored, the lip-edges hyaline, contrasting, externally oblique. Receptacle 

 hyaline becoming yellowish, often suffused with blackish brown except the lower portions of cells I, III, 

 and VI, and usually cell V. Outer appendage consisting of a basal cell mostly free, bearing terminally 

 a single branch typically once branched above its basal cell, the branchlets elongate, thick-walled, rigid, 

 more or less tinged with brow n. The inner appendage consisting of a much smaller basal cell, producing 

 either a short tw r o-celled branch with one or two terminal antheridia, or two longer branches w hich may 

 be once branched; the branches like those of the outer appendage but shorter. Peritheeium 120 X 35 p. 

 Total length to tip of peritheeium 275 ft; to insertion-cell 150 /(. Appendages, longest, 550 ft. 



On Diachromus gcrmanvs Linn., Florence Museum, Florence. Hope Coll. No. 344^, 319, France 

 and Portugal; on Anisodactylus militaris, No. 315, Sardinia; on A. heros Fabr., No. 316, "Europe." 



This is a characteristic form, occurring usually on the elytra of its host, distinguished by its long, 

 apparently invariably once-furcate outer appendage, long clear brown blunt tipped peritheeium, and 

 hyaline, or but slightly suffused receptacle. The figure, which represents one of the types on Ophonus 



