NEW LABOULBENIALES. 683 



No. 1730,Mandeville; No. 1908, and 1909, Williamsfield; No. 1925, 

 Porous; No. 1926, Battersea and No. 2045, Clarkstown, Jamaica, 

 W. I. No. 2806, St. George, Grenada, W. I. 



In general form and in the verrucosity of the venter of its perithe- 

 cium, this species is similar to S. micrandrus, to which it is nearly 

 related. It differs chiefly in its constantly four-celled appendage, 

 its usually verruculose neck, and in the conformation of its apex. 

 An abundant series of specimens has been examined. 



On species of Ili/ihca, from the West Indies, Kamerun, Borneo and 

 New England, I have obtained a form which, although subject to 

 great variation, does not seem satisfactorily divisible into more than 

 one species. The variations, however, are such, except as regards the 

 appendage, that it is almost impossible to give a composite diagnosis 

 which would be satisfactory. These variations are apparently in 

 part regional, in part due to differences in position of growth, and in 

 all probability to some extent are owing to differences in the hosts; 

 although the latter do not vary very greatly. I have therefore 

 selected as the Type the most characteristic variation, which has been 

 found on the thorax, only, of a new species of Ilythca from Jamaica, 

 and have appended notes on the more important deviations from this 

 type that have come under my notice. 



Stigmatomyces Ilytheae nov. sp. 



Receptacle contrasting with the more or less uniform suffusion of 

 the parts above, quite hyaline, or becoming very faintly yellowish, 

 very stout and thick walled; of almost uniform width, or but slightly 

 narrower at the rounded base; the minute foot sometimes lateral; 

 the subbasal cell somewhat longer than the basal. Stalk-cell of the 

 appendage somewhat obliciuely related to the subbasal cell, and 

 occupying more than one third of its width ; stout, hardly longer than 

 broad, externally very slightly convex or almost straight, but distally 

 rounded and protruding conspicuously below the insertion. Append- 

 age consisting of five cells, relatively short and broad, tapering more 

 or less uniformlv to the erect terminal antheridium, which bears a 

 spine sublaterally at the base of its erect neck: the basal cell deeply 

 tinged with amber-yellow, concolorous with the stalk-cell, the walls 

 of both clear amber-brown, small, short, subtriangular; the rest of the 

 appendage paler; the fifth cell producing a single antheridium, while 



