— 9 — 
California: Soldiers' Home, Los Angeles Co. (Dr. Hasse, 1902 : herb. 
C. F. Baker). 
A quite peculiar species, very distinct by its habit, which recalls that of 
an Acaulon, its puliform excurrent nerve, and its loose smooth areolation, a 
little chlorophyllose below and hyaline above. 
Pleuridium Bakeri Card, and Ther. 
Plants short, loosely caespitose, yellowish green. Stem 2-4 mm. long, 
erect, simple. Leaves erect, the lower minute,, distant, the upper longer, 
lanceolate-subulate, acute, entire, rarely subdenticulate at apex, subcanalic- 
ulate by the indexed margins, 1.3 s by 0.35 mm.: perichaetial leaves twice as 
long, gradually subulate; costa broad, 80-100//, percurrent, somewhat nar- 
rower in the perichaetial leaves, lower cells pellucid, subrectangular, 24/; by 
12 //, median and upper narrower, 29-30// by 5//, opaque, incrassate. Seta 
erect, short, 0.4 mm. long; capsule immersed, ovate, somewhat gibbous, 
obtusely apicullate, smooth, orange when mature, 1 mm. by 0.6 mm. Calyp- 
tra cucullate, covering Y~) / 2 the capsule. Spores subglobose, minutely 
papillose, 24-30// in diameter. Seemingly dioicous, antheridial buds 
unknown. Plate XVI. 
California: On ground in old pastures, foothills near Stanford Univer- 
sity (C. F. Baker, 1902). 
Var. elongatum Card. & Ther. 
Differs from the typical form in the longer stems and longer and more 
dexuous upper leaves. 
California: On wet clay soil, foothills near Palo Alto (C. B. Baker, 1902). 
Distinguished from P. subulatinn Br. Eur. by the shorter and less 
finely subulate leaves, with a broader costa. The later character also sepa- 
rates our species from P. Bolanderi C. Muell. , which, besides, has the 
leaves distinctly denticulate on the margins from the middle upward. P. 
Ravene l li Aust., of which we have seen no authentic specimen, according 
to the description has carinate leaves, excurrent costa, and synoicous inflor- 
escence. If the inflorescence of P. Bakeri is, as we think, really dioicous, 
this character would distinguish it from all the other North American and 
European species of Pleuridium. 
Dicranella curvata Sch. var. Missourica Card. & Ther. 
Differs from the type in the less distinctly striate capsule and the 
broader and shorter leaf cells. 
Missouri: Seligman, on ground (B. F. Bush, 1898). 
Dicranum alatum (Barnes) Card. & Ther. 
Dicranum Bonjeani DeNot. var. alatum Barnes. 
Illinois: Chicago (Dr. J. Roll, 1888). Wisconsin: Madison (Cheney 
and True). W. Minnesota: Cedar Lake, near Montevideo, Chippewa Co. 
(J. M. Holzinger, 1901). 
The nerve bearing on the back two high, serrate lamellae, and the 
shorter, thinner- walled cells of the areolation, seem characters of sufficient 
value to separate this moss from D. Bonjeani. Plate XVII. 
