326 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE/E. 



Sphaleromyces Latonse nov. nom. Plate L, figs. 1-3. 

 Corcthromyccs Latonos Thaxter. Proc. Am. Acad, Arts and Sci., Vol. XXXVII, p. 41. June, 1901. 



Perithecium reddish brown with a purplish tinge, often straight, or externally concave, slightly in- 

 flated; the lip-cells forming a small short, slightly bent, nearly cylindrical, truncate, or papillate terminal 

 projection, which is rather abruptly distinguished; the secondary stalk-cell, and the basal cell above it, 

 bulging outward more or less prominently, and separated by a rather conspicuous irregular indentation: 

 the stalk-cell small and squarish. The basal cell of the receptacle asymmetrical; its anterior margin 

 straight and perpendicular, the posterior slightly curved and oblique; its distal margin oblique with a 

 posterior protrusion ; its slender base translucent, but otherwise opaque, the opacity involving a portion 

 of the small flattened subtriangular subbasal cell. The appendage consisting of a series of about five 

 successively smaller hyaline cells, the lowest greatly flattened; the series above, the distal cells of which 

 soon disappear, often turned outward so as to become almost horizontal in position, giving rise from their 

 inner sides to numerous hyaline branches, which may be more or less copiously branched. Spores about 

 35 X 2 (i. Perithecium 90-105 X 20-25 fi, the stalk and basal cells together 20-25 ft. Receptacle 110 X 

 50 (distal end) X 10 p. (base). Total length to tip of perithecium 225-250 //. 



On the legs and abdomen of Laiona Spinolm Guer. Bogota, Columbia. Berlin Museum, No. 834. 



Although I have been unable to determine with absolute certainty, young specimens of this species 

 appear to produce solitary antheridia on the branchlets, and I have therefore included the species in 

 Sphaleromyces to which in other respects it corresponds exactly; although somewhat peculiar from its 

 condensed primary appendage and large opaque distally prominent basal cell. The types were found in 

 company with Laboulbenia Laiona on various parts of the host. 



Sphaleromyces obtusus Thaxter. Plate LII, figs. 11 13. 

 Proc. Am. Acad. Arts, and Sci., Vol. XXXV, p. 440. April, 1900. 



Perithecia relatively large, clear dark brown becoming almost opaque; the inner margin nearly 

 straight, the outer strongly convex; tapering very slightly basally and distally; the tip paler brown, 

 abruptly distinguished, and when viewed sidewise flaring, with straight divergent lateral margins, the 

 distal margin as broad as the portion of the perithecium below the tip, and slightly concave, the outer lips 

 more prominent and much broader than the inner: when viewed at right angles to this position the tip 

 appears in general bluntly rounded, not expanded, the more or less papillate tips of the lip-cells situated 

 in asymmetrical pairs, which are visible above and below a broad bluntly rounded median portion between 

 them: the basal cells colored like the perithecium, distinct, hardly broader than the stalk-cell which is 

 hyaline contrasting thick-walled and about twice as long as broad. Receptacle small, suffused with brown, 

 two celled; the septa somewhat oblique, the upper cell contrasting abruptly with the colorless stalk-cell, 

 and giving rise laterally to the slightly divergent appendage, which consists of from five to six nearly opaque 

 brown cells, separated by oblique septa; each producing distally on the inner side a short hyaline branch, 

 sometimes once branched. Spores about 40 X 3.5 \i. Perithecia 140-150 X 40-45 fx, the stalk-cell 

 35 X 20 /i. Receptacle not including foot 27-35 X 10 /i. Appendage, mostly broken 70-100 /<. Total 

 length to tip of perithecium 230-245 /«. 



On Laihrobiurn Illyricum Dej., British Museum, No. 3S4. Algeria (?). On superior surface of 

 abdomen. 



Sphaleromyces propinquus Thaxter. Plate LII, figs. 14-1G. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 441. Apiil, 1900. 

 Like <S. obtusus in size, form, and color, except that the tip of the perithecium is symmetrical or nearly 

 so, the lips forming a broadly rounded blunt terminal prominence with sometimes a slight median eleva- 

 tion, while at the base the tip is characteristically broadened through the presence of distinct lateral ele- 

 vations on either side: the stalk-cell rather abruptly swollen below the basal cells of the perithecium. 



On Lathrobium, sp. indet., British Museum, No. 383. Europe. On superior surface of abdomen. 



