EXTRA-AMERICAN LABOULBENIALES. 711 



that the differences which separate the two, and are inthcated in the 

 pubhshed figures, are constant and more than sufficient to distinguish 

 them specifically. The present species is differentiated by the char- 

 acters of its receptacle, appendage and perithecium, which appear to 

 be quite constant, and may be summarized as follows. 



Subbasal cell of the receptacle prolonged to form a more or less 

 clearly distinguished, blunt, tooth-like protrusion which projects 

 beyond the base of the stalk-cell of the perithecium, the axis of which 

 makes a considerable angle with that of the receptacle. Appendage 

 more divergent and much longer than that of R. crispafus, the branches 

 distinctly shorter and more numerous. Stalk-cell of the perithecium 

 much shorter, stouter; the perithecium uniformly dirty yellowish 

 brown, rather strongly curved outward, the apex blunt, broad, without 

 suffusions or other modification. 



This form has been obtained from species of Diopsis; Xo. 859, 

 Berlin ^Museum, from northern Kamerun, and Xo. 739, British Mu- 

 seum, from Port Xatal. 



Abundant material of the typical R. crispafus has been examined as 

 follows: Xos. 2302, 2715, 2720, from Kamerun, and also from Port 

 X'atal, Usambara and Killimadjaro, East Africa, the last kindly com- 

 municated by Dr. Speiser. The species is most readily recognized by 

 its erect stalk-cell and very different perithecium, the tip of which is 

 characteristically modified and colored, as is represented in the origi- 

 nal figure; 1. c. plate LII, fig. 20. 



Rhizomyces cornutus nov. sp. 



Receptacle yellowish; the basal cell subhemispherical, penetrating 

 the host by a rhizoidal apparatus; the subbasal cell slightly broader 

 than long, bearing the stalk-cell of the perithecium distally and the 

 appendage distally and laterally. Appendage erect, or slightly di- 

 vergent; its axis consisting of about twelve cells; the basal small and 

 nearly opaque, the rest becoming yellowish with a brownish tinge, the 

 distal one paler and smaller, all bearing single external branches super- 

 posed in a single series, that from the basal cell lacking or abortive; 

 the rest, except at the very tip, fertile, consisting of two cells ; a basal 

 bearing above, next the axis, usually two antheridia, and externally a 

 somewhat elongate subbasal cell in which the lumen is nearly obliter- 

 ated, usually slightly curved inward and bearing externally a series 

 of four or five slightly curved, simple, closely set, rather short and 



