352 



MONOGRAPH OF THE LABOULBENIACE^E. 



probably as a result of the position of growth, there seem to be no essential differences between 

 this and the type forms. 



Laboulbenia Oberthuri Giard. Plate XXII, fig. 39. 



Thaxter, Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 477. 



Nearly hyaline except the brown or smoke-colored perithecium and sub-basal cell of the 

 receptacle. Perithecium large, inflated towards the base, the narrower distal half abruptly 

 rounded and contracted below a rather narrow apex with protruding lips bent outward ; general 

 color dark brown, much deeper below the apex. Appendages numerous, crowded, slender, short, 

 the lower segments inflated, arising as in L. Guerinii. Receptacle elongate, consisting of a short 

 curved stout nearly hyaline basal cell, a very long sub-cylindrical sub-basal cell, smoky brown in 

 color, with deeper brown wart-like or scale-like scattered prominences of varying size, the re- 

 maining cells normal except that the insertion-cells of the appendages are irregularly divided. 

 Perithecium, 300-315 x 120 ft. Receptacle, 1 mm.-900 ft ; its sub-basal cell 370-425 x 65-75 ft. 

 Total length to tip of receptacle, 1.225 mm. 



On Orectogyrus heros Reg., Madagascar. 



This fine species was kindly communicated to the writer by Professor Giard, who dedicated 

 it to M. Rene" Oberthur, its discoverer. It is one of the largest species of the genus, its dimen- 

 sions being exceeded only by L. Kunkeli, L. palmella, and the largest forms of L. variabilis. 

 Although closely allied to L. Guerinii it is abundantly distinct and recognizable at a glance by 

 its peculiarly modified sub-basal cell. The appendages are for the most part broken in the three 

 specimens which constitute the types, and in more perfect examples may prove to be more 

 highly developed than is indicated in the figure. It will be noticed that the latter is drawn with 

 a somewhat lower combination than the other figures of the plate. 



Laboulbenia Orectogyri nov. sp. Plate IV, fig. 5. 



Perithecium blackish brown, nearly opaque, rather short and stout, curved, the apex well de- 

 fined, the lip-cells irregularly prominent. Receptacle long and rather slender, cells I and II much 

 elongated, the former deeply suffused distally, the hatter brownish but translucent, the remainder 

 deeply suffused or quite opaque. Appendages numerous in a rather dense tuft, arising as in 

 other aquatic species ; hyaline, short, sparingly branched, constricted at the somewhat suffused' 

 septa. Perithecia, 140 x 50 /x. Receptacle, 450 /x. Total length, 575 /x. Appendages (longest), 

 45 /x. Spores (measured in perithecium) about 50 fx. 



On Orectogyros Bedeli Reg, Bopora, Liberia, Africa (O. F. Cook). 



The several types of this form include but a single mature specimen, so that it is uncertain 

 whether the coloration described or the very abrupt curvature of the perithecium are constant 

 characters. The younger specimens, however, are sufficient to show that the appendages are 

 unlike those of either of the other aquatic Laboulbenia?. The species is most nearly related to 

 L. Guerinii, from which it differs in its more numerous and slender appendages as well as in 

 its general form. With the Madagascar species (L. Oberthuri), which occurs on a similar host, 



