(I2 7 ) 



Bryum ventricosum compactum (B. & S.) Williams. 



(B. -pseudotriquetrum compactum B. & S.) 



Dawson, July 17, in fine fruit. A much smaller plant 

 than the species, in very compact tufts. The leaf-cells and 

 spores seem to be rather smaller also. The medium cells 

 measure .008 mm. wide and .016 to .025 mm. long, the spores 

 up to .014 mm. The dorsal plates of teeth are rather narrow, 

 about 1 to 3 near base, lamellae 30. Cell walls of the leaves 

 usually seen to be distinctly pitted under a magnification of 

 300 dia. or more (583). 



Bryum submuticum Philibert, sp. nov. 



Dioicous. Male flowers bud-like with leaves ovate and 

 more or less spreading but not reflexed near middle, abruptly 

 much smaller on stem below. Plants growing in extensive 

 mats 2 or 3 cm. thick, stems scarcely branched, felted to- 

 gether with a dense mass of radicles below. Outer peri- 

 chaetial leaves 2! mm. long, ovate, somewhat acutely pointed 

 with costa percurrent or excurrent the length of 1 or 2 short 

 cells, upper stem leaves a little shorter and costa vanishing 

 just below apex, all entire or nearly so with a distinct revo- 

 lute border of about 3 rows of long narrow cells near middle, 

 towards apex the margins flat and cells not much elongated. 

 Inner perichaetial leaves ovate-lanceolate with costa vanish- 

 ing just below apex. Median leaf-cells about .035 mm. long 

 and I- as broad, lower cells short rectangular (about i-i.l or 

 2). Cell walls all somewhat thickened but not pitted. Cap- 

 sule with lid up to 2^ mm. long, slightly narrowed under the 

 mouth, the sporangium gradually narrowed to a shorter col- 

 lum. Exostome pale yellow below. Plates of teeth narrow 

 (about 1-3) near base, lamellae from 25-30. Basal mem- 

 brane of endostome extending 4- up, the segments broadly 

 perforated and separated by mostly 3 appendiculate cilia. 

 Two or 3 rows of transversely elongated cells about mouth 

 of capsule, the cells near middle broad, often scarcely elon- 

 gated with somewhat sinuous walls, at base very irregular 

 and sinuous walled. Oblong stomata about .035 mm. long. 

 Smooth spores up to .014 mm. Annulus of 4 rows of cells. 

 (Plate 19.) 



This species is quite near the preceding variety but still 

 smaller and more slender. The leaves are broader, shorter 



