THAXTER. — ARGENTINE LABOULBENIALES. 175 



subbasal coll of the reccptaclo occupies a central position, bordered 

 on one side by the subbasal cell, on the other by the basal cell of tiie 

 appendage, both of which thus tend to become marginal extending 

 to or toward its base. Peritheciuni relati\ely large, with a single 

 ascogenic cell, and five wall-cells in each row; the short stalk-cell 

 forming a narrow isthmus between the broad base and the receptacle. 

 The appendage, above its adherent basal cell, forming a compact 

 free structure consisting of a flattened basal cell in some species 

 obliquely divided, which is surmounted by two cells both bearing 

 single simple antheridia; one surmounted by a spine, or bearing also 

 a small cell which subtends a third antheridium, on which the lateral 

 spine is borne; the antheridia arising close together in a characteristic 

 group; their ^•enters closely approximated, their stout necks distally 

 somewhat di\'ergent. Trichogynes bicellular above their insertions, 

 the distal cell elongated at right angles to the basal cell on both sides, 

 and distally beset by numerous vesicular receptive prominences. 



The above diagnosis is based upon the examination of several 

 species of this genus which are known to me from various regions, 

 only two having been obtained in the Argentine. It is most nearly 

 related to Acompsomyces. 



Synandromyces Telephani nov. sp. 



Perithecium erect, relatively very large; becoming tinged with 

 amber-brown, straight; the main body, including the basal cell 

 region, symmetrically inflated, subfusiform, but often somewhat 

 more tapering above and rounded at the base; the four cells of the 

 first and second tiers of wall-cells separated by a corresponding num- 

 ber of more or less distinct prominences; a terminal portion rather 

 abruptly- distinguished from the main body, and often subtended 

 by slight prominences, straight, narrow, isodiametric above, more 

 deeply suffused, as a rule, than the main body, but nearly hyaline 

 below, slightly inflated distally immediately below symmetrical hya- 

 line truncate or slightly papillate and sulcate apex: the stalk-cell 

 small, constricted to form a short slender isthmus, which is bent 

 sidewise and connects laterally with the basal cells of the perithecium. 

 Receptacle short and compact, its axis straight, the basal cell narrow, 

 clavate above; the subbasal cell extending nearly to the foot, slightly 

 enlarged distally, very narrow below; the basal cell of the appendage 

 extending not quite so low as the subbasal cell, which it closely re- 

 sembles, though distally more abruptly broadened to form the hori- 



