30 PROCEEDINGS OF THE AMERICAN ACADEMY 



species of Heimatomyces serves accurately to define the characters 

 of this genus, which proves to have been based by Peyritsch almost 

 wholly on specific characters; while it is more than probable that 

 the same author's genus Chitonomyces is also similarly based, and 

 should be united with Heimatomyces. No specimens of the former 

 genus being accessible, and the published figures leaving much un- 

 certainty as to its true nature, the name Heimatomyces has been 

 chosen to distinguish the American forms, their generic identity 

 with H. paradoxus being unquestionable. The type of the genus 

 is a very simple one, and may be characterized as follows. 



HEIMATOMYCES, Peyritsch. 



Receptacle consisting of a basal and terminal portion : the basal 

 including five cells, the two lower superposed, the three upper 

 small and forming the base of the perithecium: the terminal por- 

 tion including four cells more or less connected laterally with the 

 perithecium, the terminal cell always free, bearing at its rounded 

 apex a single simple thread-like appendage: the subterminal cell 

 free from or connected on its inner side with the two remaining 

 cells, the upper of which gives rise, from the angle made by the 

 inner wall of the perithecium, to several simple thread-like eva- 

 nescent appendages (trichogyne and antheridia?). Perithecium 

 simple or appendiculate, symmetrical or asymmetrical. Asci sub- 

 lenticular, 4-sporic, spores fusiform or subfusiform, septate. 



In a single species (H. Halipli) the middle of the three cells 

 which usually form the base of the perithecium is enlarged, and 

 extends the whole width of the receptacle, the base of which thus 

 consists of three superposed cells. The terminal and subterminal 

 cells of the receptacle may be elongated or modified; but the total 

 number and general relative position of the cells seem to be very 

 constant. In only two species, H. paradoxus and H. appendicu- 

 latus, is the perithecium modified by an outgrowth from one of its 

 cells. 



Heimatomyces simplex, nov. sp. 



Pale yellowish or faintly brownish. Perithecium rather slender, 

 continuing the strong curve of the receptacle evenly outward to its 

 rather coarse blunt apex. Basal cell of the receptacle much longer 

 than the flattened sub-basal cell, the septum between the two often 

 obsolete : terminal cell bell-shaped, small. Spores 26 X 11 /m. 



