THAXTER. NEW LABOULBENIACE.E. 429 



as long as broad : the second tier consisting of three cells, the posterior 

 one longest, the median longer than the anterior, which terminates in 

 the antheridium, which is subtended by four basal cells, two of them 

 outer and lower and separated by oblique partitions, while a smaller 

 upper one lies on either side: above the antheridium two vertically elon- 

 gated cells form the clearly defined base of the perithecium ; external 

 to these cells and somewhat obliquely separated from them lies the broad 

 base of the inner marginal cell of the distal portion of the receptacle, 

 which lies next above the middle cell of the upper tier, its cavity nearly 

 obliterated above as the spores mature, the primary appendiculate cell 

 which terminates it rather elongate ; the proliferation of the outer mar- 

 ginal cell beginning quite near its base, forming a series of about eight 

 cells separated by oblique septa and terminated by small appendiculate 

 cells; the appendages very small, vesicular, brownish below. Perithecia 

 127-175 X 35-37 fx. Receptacle, basal part, 75-110 fx, distal part 

 75-110 /x. Appendages 6X3 /x. Total length to tip of perithecium 

 240-375 fx, to tip of receptacle 190-205 fi. 



On Tropistemus sp. indet., Paris Museum, No. 47. Mexico. On 

 tip of abdomen. 



Limnaiomyces Hydrocharis nov. sp. 



Hyaline. Perithecium rather stout and short, somewhat inflated, its 

 tip abruptly bent outward, the apex bluntly rounded or nearly truncate; 

 the tip and the appendiculate cell usually symmetrically divergent. 

 Basal portion of the receptacle relatively short and stout but otherwise 

 similar in structure to that of L. Tropisterni ; the two basal cells of the 

 perithecium almost obliterated at maturity so that its base appears to 

 rest immediately on the antheridium ; the distal portion of the receptacle 

 bordering the perithecium to its tip, the inner cell becoming almost wholly 

 obliterated in the middle and terminating in a short bell-shaped appen- 

 diculate cell which is slightly divergent: the outer marginal cell usually 

 proliferating three times ; of the three cells thus formed the two inner, 

 as a rule, produce well developed, long, simple, hyaline appendages; 

 not, however, as well developed as the primary appendage, which may 

 be twice as long as the perithecium. Spores 50 X 3 p. Perithecia 

 60-80 X 17-20 /<. Receptacle, basal part, 50 X 20-26 ju, distal part 

 50-62 ^. Appendages, longest, primary 140 jx, secondary 70 p. Total 

 . length to tip of perithecium 100-128 jx. 



On Hydrocharis obtusatus Say, Cutts Island, Kittery Point, Maine. 

 At tip of abdomen. 



