732 THAXTER. 



to 600 /i, these differences being largely due to variations in the 

 length of the perithecial neck, which may be very long and slender 

 or short and very stout. The prolongation of the outer lips to form 

 an obliquely pointed apex is always characteristic. The S. ItaUcus 

 of Spegazzini, which is also said to occur on Borboridae, does not 

 appear to differ in any respect from smaller forms of this species. 

 It does not appear to occur in the Western Hemisphere where it is 

 replaced by other allied forms which occur on members of the same 

 family. 



Stigmatomyces platystoma nov. sp. 



More or less curved throughout, or the extremity, only, curved 

 outward. Receptacle hyaline; the basal cell narrower below, usu- 

 ally somewhat longer and distally broader than the subbasal cell, 

 the posterior walls much thicker, the margins individually somewhat 

 convex; the subbasal somewhat prominent below the stalk-cell of 

 the appendage; which is pale brownish yellow, small, externally 

 somewhat concave, abruptly broader and prominent below the 

 insertion ; which is opposite the distal margin of the perithecial stalk- 

 cells. Axis of the appendage consisting normally of seven cells; the 

 basal and subbasal nearly equal and more deeply suffused with yellow- 

 ish brown, their margins but slightly convex; those above succes- 

 sively slightly smaller; all strongly convex, the septa but slightly 

 oblique; each of the four lower cells producing two superposed an- 

 theridia on the inner side; the upper seated on the under, and fur- 

 nished with a longer, more conspicuous, stout, appressed neck; the 

 fifth cell bearing a single antheridium, the terminal cell distally inflated 

 and partly free; the subterminal bearing an abortive antheridium, 

 which may proliferate, producing a few clavate branchlets. Stalk- 

 cell and secondary stalk-cell of the perithecium hardly longer than 

 broad, the latter asymmetrically and obliquely overlapping two thirds 

 or more of the former, on its left side; the basal cells smaller, sub- 

 triangular: venter tapering to a narrow base, sometimes twice as 

 broad distally, slightly longer than the distal portion; the neck with 

 abruptly distinguished spreading base, its outline somewhat irregular, 

 hardly tapering, short; the tip and apex distinguished by an abrupt 

 constriction, somewhat inflated; the tips of the four coarse lip-cells 

 bluntly rounded and prominent about the pore: the wall-cells de- 

 veloping a slight spiral twist which is usually inconspicuous. Spores 

 30X3.OM. Perithecia 85-100 m; venter 45-55 X 30-32 ^ distally 



