33 ° Massee and Salmon. — Researches on 
Hab. — On Horse-dung, Reigate, Surrey, Dec. 1900; on dung of 
Mexican Deer ( Cariacus mexicanus ) and Dorcas Goat ( Capra dorcas ), 
Kew, Dec. 1900. 
S. depauperatus (Berk, and Br.), Rehm; Mass. Brit. Fung. FI.* iv, 
170 (1895). 
Hab. — On dung of Mexican Peer ( Cariacus mexicanus), Kew, Feb. 
1901. 
S. neglectus, Boud., Mem. Ascob. 231, PI. 9, xx (1869); Mass. 
Brit. Fung. FI. iv, 17 1 (1895). 
Hab. — On dung of Ural Wild Sheep ( Ovis vignei), Kew, Feb. 1901. 
Pezizaeeae. Helotimn lacteum (Cke and Phill.), Mass. Brit. 
Fung. FI. iv, 269 (1895). 
Hab. — On Rabbit-dung, Kew, Dec. 1900. 
Perisporiaeeae. Pleuroascus, gen. nov. 
Perithecia subiculo intertexto pannoso distincto vel confluente in- 
sidentia, atra, astoma, membranaceo-carbonacea, fragilia, contextu 
parenchymatico, appendicibus pluribus hyalinis arete spiraliter con- 
vokes instructa ; ascis globosis minutis numerosissimis mox diffluenti- 
bus in hyphis ramosis pleurogenis ; sporis minutis fuligineis globosis. 
The present genus appears to be distinct among the Phaeosporae 
of the Perisporiaeeae in the dense pannose subiculum and the minute 
globose laterally-borne asci. The asci are produced in great numbers, 
and arise in a glomerulate manner on the delicate branched hyphae 
which fill the perithecium. This latter character suggests affinity with 
Cephalotheca. 
P. Nicholsoni, sp. nov. (Fig. 25). 
Peritheciis in subiculo pannoso distincto vel confluente primum 
albo deinde rufescente e hyphis delicatulis ramosis intertextis com- 
posite plus minus immersis, dense gregariis, parvis, 130-200 /x diam., 
atris, fragilibus, contextu parenchymatico e cellulis distinctis 6-10 /x 
latis composito, appendicibus pluribus e parte perithecii inferiore 
orientibus hyalinis arete spiraliter convolutis compressis septatis ; 
ascis numerosissimis minutis globosis 8 n diam., mox difhuentibus, 
in hyphis ramosis dense glomerulatis ; sporis octono-conglobatis, 
globosis, minutis, circ. 3 /x diam., fuligineis. 
Hab. — In fimo Caviae cobay ae (Guinea Pig), Kew, England, Jan. 
1901 (coll. Geo. Nicholson). 
The dense pannose subiculum, in which the perithecia are at first 
