654 THAXTEK. 



Female hidividual consisting of a well developed basal cell, a small 

 subbasal cell which bears a sterile appendage consisting of a stalk-cell 

 and peculiarly modified terminal cell. The stalk-cells and basal cells 

 of the perithecium not distinguishable at maturity, all partly sur- 

 rounding the lower ascigerous region. Spores hyalodidymous, asco- 

 genic cell single in the type. 



In this very distinct type the stalk- and basal cells of the perithe- 

 cium ai'e apparently combined to form the wall of the lower portion 

 of the ascigerous cavity, so that what appears to be its main body 

 comprises these cells, as well as the usual four tiers of wall-cells: but 

 since the types are all very young or fully matured, it has not been 

 possible to determine how closely the cell-structure of this region 

 corresponds to that which I have described in detail in connection 

 with the genus Laboulbenia. The condition described is approached 

 in Stigmatomyces virescens, among hermaphrodite forms, and is very 

 similar to that which occurs in species of Dimcromyccs, in which the 

 cell-boundaries are quite obliterated at maturity. The peculiar sterile 

 appendage-cell, which occurs in both sexes, recalls the somewhat 

 similar sterile appendage in the female of species of Dioicomyces. 

 The genus, however, is evidently most nearly allied to Divieromyces. 



Nycteromyces Streblidinus no v. sp. 



Male Individual. Basal cell hyaline, long and slender, tapering 

 continuously to the base, where it is slightly enlarged in relation to the 

 small irregularly formed blackened foot, extending as a pointed pro- 

 longation slightly beyond the latter. The two to five small short 

 hyaline cells superposed above it, bearing single antheridia in a uni- 

 lateral series, their venters in close contact, their short broad truncate- 

 conical necks free, diverging upward; the antheridial cells about six 

 in number: the subterminal sterile cell flattened, smoky or dull pur- 

 plish brown, the terminal one bullet-shaped, or tending to subconical, 

 similarly colored, deeper at the septum, distally apiculate. Total 

 length 86-110 M. Basal cell 40-52 X 10 /x. Antheridia 18X12/X. 

 Terminal cell 18 X 10-14 /i, the subterminal 4X15^ broad. 



Female Individual. Basal cell hyaline, long and comparatively 

 slender, broader distally, its lower three fourths nearly uniform in 

 width to the small irregular black foot, where it is slightly enlarged 

 and extends into a brownish tooth-like prolongation resting on the 

 host beside the latter. Subbasal cell very slightly longer than broad. 



