1904] CAXDOT AND THERIOT: MOSSES OF NORTH AMERICA 379 
Plagiothecium Groutii Card. & Thér., sp. nova——Monoicum, 
tenellum, nitidum, densiuscule depresso-cespitosum. Caulis ten- 
uis, prostratus, ramis brevibus numerosis complanatis. Folia 
minuta, compressa, distiche erecto-patentia, o.7-0.8"" longa, 
0.3-0.35"" lata, haud decurrentia, oblongo-lanceolata, lateralia 
subcultriformia, breviter et latiuscule acuminata, margine plana, 
enervia, caulina subintegra vel obsolete denticulata, ramea in 
tertia parte superiore vel fere e medio minute sed distincte ser- 
rulata, cellulis mediis linearibus, angustissimis, 60-90" longis, 
6 latis, superioribus brevioribus, inferioribus rectangulis, infimis 
majoribus subdilatatis. Folia perichaetialia oblonga, subito 
breviter cuspidata, subintegra vel ad basin acuminis sinuolata. 
Capsula in pedicello tenui, erecto, rubello, r-1.5™ longo, hori- 
zontalis, inclinata suberectave, minuta, ovata, vix 1™” longa, 0.5— 
0.7™" crassa, laevis, sicca sub orificio non constricta, collo brevi, 
operculo rostrato. Sporae irregulares, diam. 8-20. Plate XXIV. 
Delaware : Hampstead, depression in base of a chestnut tree (A. J. Grout, 
1899). 
Allied to P. elegans Sch., but easily distinguished from it by the shorter 
leaves, more abruptly and broadly acuminate, the rameal rather strongly 
denticulate in the upper third, the perichaetial bracts subentire, with a shorter 
acumen, the smaller capsule, the beak of the lid thinner, and the monoicous 
inflorescence, 
Amblystegium laxirete Card. & Thér., sp. nova.— E  sectione 
A. riparii, sat robustum, fluitans, sordide viride, usque 10™ lon- 
gum, vage pinnatum, ramis inaequalibus patulis, attenuatis, laxe 
foliosis, Folia compressa, distiche patula, ovato-lanceolata, 
breviuscule acuminata, circiter 3™° longa, 1”” lata, marginibus 
planis integris, costa valida, 100 # basi crassa, longe ultra medium 
€vanida, rete laxo, cellulis 60-80 longis, 12¢ latis, parietibus 
angustis, mollibus. Caetera ignota. Plate AAY, 
~ Missouri: Monteer, in spring (B. F. Bush, 1899). 
The leaves shorter acuminate, the longer and thicker costa, and chiefly 
the loose areolation, at first sight distinguish this moss from A. riparium, 
The last character also separates it from A. vacillans Sulliv. From A. 
Kochit Br, Eur. it differs by its larger leaves and its much stronger and longer 
nerve, * 
AMBLYSTEGIUM BREVIPES Card. & Thér., Minn. Bot. Stud. 
