XEW DIMORPHOMYCETEAE. 233 



to a slender blunt hyaline apex; below red brown, the suffusion be- 

 coming deeper with age and involving the basal cell also; its distal 

 half lying above the apex of the perithecium; the upper cell sub- 

 triangular, terminating below the apex of the middle one, and bearing 

 a single terminal primary appendage similar to those on the anterior 

 side. Perithecium stout, subsymmetrical, erect or slightly tilted 

 toward the anterior side, ovoid or broad-fusiform; the apex sub- 

 truncate, hyaline, subtended by a reddish brown suffusion which also 

 involves the venter and eventually the whole perithecium and the 

 adjacent portions of the receptacle. Perithecia 55-64 X 25-30 m- 

 Spores about 30 X 4 m- Basal cell of receptacle 25-42 ju. Subulate 

 appendage 38-42 /z. Total length to tip of perithecium 92-125 X 



42-50 M- 



On Vropoda sp. sensu latiore. No. 2692. Verdant Vale, Arima, 



Trinidad, B. W. I. 



This species is at once distinguished from other known forms by 



its rigid, suffused, subulate subterminal appendage, as well as by the 



character of the other appendages and the position of their slender 



recurved terminations. In general appearance it closely resembles 



species of Riclcia of compact form which occur on similar hosts. 



Dimeromyces adventitiosus nov. sp. 



Male indhidud pale yellowish, the receptacle consisting of five or 

 more cells; the basal larger, subtriangular, the rest flattened and 

 somewhat oblique, producing single slightly divergent antheridia, or 

 occasionally short scattered simple sterile branches. The appendage, 

 an undifferentiated continuation of the axis, often bearing numerous 

 antheridia on one or both sides; a large secondary appendage some- 

 times developed from the subbasal cell, of indefinite growth, and bear- 

 ing numerous antheridia from the upper margin. Antheridia straight, 

 or the necks slightly curved; the stalk-cell well distinguished, venter 

 slightly inflated, neck moderately well distinguished. Length of 

 receptacle proper about 25 ji. Primary appendage 40 /x or more, 

 sometimes o\er 200 ix, the large secondary appendages somewhat 

 shorter. Antheridia about 22 X 5 ix. 



Fenude individual pale yellowish, the receptacle consisting of about 

 six to eight flattened oblique cells; the primary appendage often 

 greatly elongated, undifferentiated. Three or four of the cells of the 

 receptacle usually producing simple, undifferentiated secondary 



