— IO — 
Fissidens Bushii Card. & Ther. 
Fissidens subbasilaris var. Bushii Card. & Ther. 
Missouri: Eagle Rock, on gravelly ground (B. F. Bush, 1897). Texas: 
(Elsa Baumann ; herb. Dr. Zickendrath). 
At first we considered, this moss as a variety of F subbasilaris Hedw. 
but further observations led us to a different conclusion, and now we think 
it preferable, on account of the monoicous inflorescence and the costa reach- 
ing the apex, to place it near F. taxifolius Hedw., of which it may be a 
subspecies, characterized by the nearly twice smaller size, the obtuse 
abruptly apiculate leaves with the dorsal wing not undulate at base and with 
smaller cells. From F. subbasilaris it is easily distinguished by the 
inflorescence and the costa reaching the apex. Plate XVII. 
Fissidens pusillus Wils. var. brevifolius Card. & Ther. 
Differs from the type in the much shorter and more abruply and shortly 
acuminate leaves of the sterile innovations. 
California: Soldiers’ Home, Los Angeles Co. (Dr. Hasse, 1902; herb. 
C. F. Baker). 
Pottia Nevadensis Card. & Ther. 
Monoicous? green; caespitose. Stems erect, short, 1-2 mm. long. 
Leaves erect, ovate, concave, median 1 by 0.6 mm., the lower smaller, all 
smooth with entire margins somewhat revolute on one side at least. Costa 
narrow, abruptly excurrent into a subpiliform apex, median cells hexagonal 
or rhomboidal, not very chlorophyllose, about 18 /i by 15//, the upper some- 
what smaller, the basal elongated rectangular 40/* by 18/*, all entirely smooth. 
Perichaetial leaves much larger and lighter colored, broader, strongly con- 
cave, reaching 2 mm. in length. Seta light colored, flexuous, 10-15 mm. 
long. Capsule 1.5-2 mm. by 0.75 mm., erect, oblong, attenuate at base, 
truncate at mouth, pale, without peristome. Operculum depressed, long 
and slenderly beaked, 1.2 , mm. long. Columella adhering somewhat. 
Spores densety papillose, 24-30/* in diameter. Plate XVIII. 
Nevada: Kings Canon, near Carson, on ground about willow thickets 
(C. F. Baker, 1902). 
This species seems very distinct from any other European or North 
American Pottia. 
Didymodon tophaceus Jur. var. decurrens Card. & Ther. 
Similar to var. flatus. Leaves remote, recurved when moist, long 
decurrent, strongly papillose on the back, costa rough. 
Texas: Shovel Mt., Burnet Co. (Rev. Franciscus Ebeling; herb. Dr. E. 
Zickendrath). 
Desmatodon Bushii Card. & Ther. 
Plants loosely caespitose, olive-green. Stems erect, 5-15 mm. long 
simple or divided. Leaves crispate when dry, when moist erect-spreading 
1-1.5 mm. by 0.4 mm., oblong-lanceolate, mostly obtuse, costa short-excur 
rent, mucronate, margins entire, longly revolute, kwer cells rectangular, 
hyaline or somewhat yellowish, 35-40/* by 9 /*, the rest roundish-quadrate, 
