— 9 - 
Perichaetial leaves erect, appressed, ecostate, short-ovate, apex rounded, 
abruptly short-opiculate. Capsule sub-horizontal or inclined, 2 mm. long, 
0.7 mm. thick, subcylindric, arcuate constricted below the orifice when 
empty, deeply sulcate in both young and mature stages ; operculum obtuse 
conical. Seta pale-red, delicate, flexuous, 2 cm. long. Annulus double, 
Peristome perfect, 0.42 mm. long, cilia nodose, minutely papillose. Spores 
smooth, 12 ju in diameter. Plate XXIV. 
North Minnesota: On Fall Lake, near the foot of Kawasatchong Falls, 
11 km. north of Ely (J. M. Holzinger, 1897. Sent as P. Muehlenbeckii Br. 
Eur.). 
This moss seems somewhat intermediate between P. striate llum Lindb. 
(P . Muehlenbeckii Br. Eur.) and P. silesiacum Br. Eur., differing from the 
former by its non-decurrent leaves, narrower at base, with a more distinct 
costa, its much longer cells, the basilar ones not porose, its more arcuate cap- 
sule, and the form of its perichaetial bracts ; and from the latter by its cap- 
sule being deeply sulcate, even when young, and its more compressed 
branches. According to the description, P . pseudo silesiacum Sch. differs 
from our species by its much shorter pedicel (1 cm.), and its costate leaves. 
Plagiothecium Groutii Card. & Ther. 
Monoicous, delicate, glossy, in rather dense depressed tufts. Stems 
slender, prostrate with numerous short complanate branches. Leaves minute 
flattened distichous, erecto-patent, 0.7-0. 8 mm. long, 0.3-0.35 mm. broad, 
not decurrent ; oblong lanceolate, the lateral subcultriform, with a shorter 
and broader acumen : margins plane, ecostate, stem leaves subentire or obso- 
letely denticulate, branch leaves in the upper third or from near the middle, 
minutely but distinctly serrulate; median cells linear, very narrow, 60-90 ju 
long, 6 ju broad, the upper cells shorter, the lower rectangular, the lowest 
larger and subdilated. Perichaetial leaves oblong, abruptly short-cuspidate, 
subentire or the lowest with sinnolate tip. Capsule horizontal inclined or sub- 
erect, ovate, minute, hardly 1 mm. long, o. 5-0.7 mm. thick, smooth, not con- 
tracted under the orifice when dry ; collumn short ; operculum rostrate. 
Seta slender, erect, reddish, 1-1.5 mm. long. Spores irregular, 8-29 /j, in 
diameter. Plate XXIV. 
Hempstead, Nassau Co., N. Y. : Depression in base of a chestnut tree 
(A. J. Grout, i899t 
Allied to P. elegans Sch. , but easily distinguished from it by its short 
leaves, more abruptly and broadly acuminate, the rameal rather strongly 
denticulate in the upper third, the perichaetial bracts subentire with 
a shorter acumen, the capsule smaller, the beak of the lid thinner and the 
monoicous inflorescence. 
Amblystegium laxirete Card. & Ther. 
Belonging to the group of A. riparium , quite robust, floating, dull- 
green, as much as 10 cm. in length, remotely pinnate, branches unequal, 
slightly spreading, attenuate, laxly foliose. Leaves flattened, distichous, 
spreading, ovate-lanceolate a little more shortly acuminate, about 3 mm. 
