412 PROCEEDINGS OF THE AMERICAN ACADEMY. 



MONOICOMYCES nov. genus. 



Receptacle consisting of a basal and subbasal cell, above which it ter- 

 minates iu a small two-celled sterile portion, the terminal cell of which 

 may or may not be in the form of a short appendage ; the subbasal cell 

 giving rise to from one to several fertile branches, the habit becoming 

 thus unilateral, bilateral or subverticillate in different species. The fer- 

 tile branches consisting of from one to several cells in different species, 

 the terminal cell of each branch normally giving rise to a stalked peri- 

 thecium and a stalked antheridium ; the remainder, if there are more 

 than one, appendiculate on the upper side, rarely (abnormally ?) produc- 

 ing an additional antheridium. Antheridium of the compound type, con- 

 sisting of a stalk composed of a pair of cells, the antheridium proper 

 consisting of certain basal cells, two tiers of peripheral cells, which sur- 

 round (not on all sides?) numerous antheridial cells and a cavity above 

 them, and three or four terminal cells, which appear to surround an open- 

 ing through which the antherozoids are discharged, and which subse- 

 quently grow upward, forming terminal simple appendages of irregular 

 length. 



Monoicomyces Homalotae nov. sp. 



Receptacle consisting of very small hyaline basal and subbasal cells 

 surmounted by a distal portion, very much as in Dimorphomyces, wliich 

 is blackish brown, the lower cell larger and distally inflated. Fertile 

 branches normally two, when the individual is bilaterally symmetrical, 

 rarely three, consisting of a single cell which bears distally an antheridium 

 from its outer and a perithecium from its inner angle. Perithecium 

 amber brown slightly asymmetrical, relatively very large, shoi-t and 

 stout, the lower lialf greatly inflated, generally more so on the outer than 

 the inner side, distally conical, the small tip not distinguished, usually 

 abruptly truncate, the stalk-cell hyaline, narrowing to its base. Anthe- 

 ridium borne on a pair of rather short stalk-cells, the basal cells some- 

 what smaller and angular, forming part of the wall around the antheridial 

 cells, the wall cells somewhat smaller than the basal cells, but large and 

 distinct, the terminal cells apparently four in number, later forming stout 

 finser-like upgrowths of unequal length. Spores about 35 X 3 /x. Peri- 

 thecia including basal cells 100-120 X 30-35 /x, the stalk-cell 35-40 /i; 

 Antheridia including stalk-cells (not the terminal projections) 70-80 

 X 30-35 jU. Sterile part of receptacle about 70 fx. 



On Homalota putrescens Woll., British Museum, No. 412, Azores. 

 On inferior surface of abdomen. 



