(251) 
smooth, up to 2 cm. high; capsule ovate, more or less nod- 
ding and curved, about 1.25 mm. long without lid, with a 
convex, slender-beaked lid .75 mm. long; exothecal cells 
about 20 # wide, aanted scarcely elongate, with walls much 
thickened at the angles; stomata in about 2 rows near base 
of capsule; teeth of outer peristome brown with distinct 
medium line, finely cross-striate below and papillose near 
apex ; segments of inner peristome papillose, narrow, scarcely 
split along the keel, as long as the teeth, with mostly single 
cilia between, from a basilar membrane one fourth the height 
of teeth; minutely roughened spores up to 20 yp. 
Apolo, 1500 meters, July 10, rg02 (2115). 
PTEROGONIELLA PULCHELLA (Hook.) Sch. MS. in Jaeg. 
Tumupasa, 430 meters, Jan. 23, 1902 (2059). Often 
growing mixed with other species. The plant called A/ezo- 
thectum nanum Besch. is evidently this species as well as 
Potamium Castquiarense Spruce. 
It seems that Schimper proposed (in MS. only) the genus 
Fterogoniella for Pterogonium pulchellum Hook., Musci 
Exot. t. 4, 1818. Jaeger was the first to publish Prerogon:- 
ella, in about 1875, and he put into it, first, Saudoma, a 
group of mosses not only very distinct as a genus from 
Schimper’s Prerogonzella, but belonging to a different family, 
true Sauloma being quite unknown from America, although 
attributed to the West Indies by Carl Miller through mis- 
taken determinations; second, Veckera C. M. in part; third, 
Ptertgynandrum and Pterogontum of Montagne; fourth, 
Metothectum Mitt.; fifth, Potamium Mitt.; sixth, Plerogonz- 
ella Sch. At present these first five genera are well recog- 
nized and quite distinct groups from the sixth, and if we con- 
tinue to use Schimper’s Pterogonzella it should evidently in- 
clude only three names as above given, out of the thirty-three 
names included by Jaeger in his genus. Thus limited, the 
genus would contain those species that have a single peri- 
stome of thick, brownish teeth, densely papillose on both sides, 
leaves smooth, ecostate or faintly bicostate and leaf-cells at 
basal angles hyaline and square to short-rectangular, never 
yellow and inflated. 
