BARNES NORTH AMERICAN MOSSES. 339 



decurrent, cochleariform, roundish oval, obtusate, incurved at the apex, 

 minutely denticulate above to middle, very papillose; upper cells rhombic, 

 lower oblong, alar quadrate, inner basal reddish; costa short, more or less 

 distinct, sometimes stout and simple: dioicous. Mac. Cat. 183. — On trees: 

 New Brunswick. 



440. Heterocladium aberransRen. & Card.— Intricate-cespitose, pale or 

 yellowish-green: stems flexuous, creeping, radiculose, more or less regularly 

 pinnate; branchlets ascending, flexuous: stem leaves squarrose, auricu- 

 late, from a cordate-ovate base, long-acuminate, generally subulate; 

 borders plane, sinuate-crenulate all around; costa forked, with one divis- 

 ion longer and vanishing about middle; areolation loose, pellucid, of soft 

 thick-walled cells, elongated, linear, truncate or obtuse, 4-10 times longer 

 than broad toward costa, others irregular ovate, roundish or sub-hexago- 

 nal, sometimes slightly papillose; branch leaves shorter, acute or obtuse; 

 perichsetial leaves acuminate to a reflexed denticulate point, thin-nerved: 

 seta purple, smooth; capsule horizontal, ovate, curved; lid unknown; teeth 

 yellow, acuminate, densely trabeculate; segments narrowly split, cilia 

 shorter, nodulose. Bot. Gaz. 15: 59. 1890.— On logs: Idaho. 



441. Tliuidiiim scitum lonchoneuron Kindb.— Stems irregularly di" 

 vided, sparingly radiculose; branchlets thick: stem leaves more broadly 

 revolute at borders below acumen, less papillose; costa stout, percurrent 

 or excurrent: branch leaves quite acute: capsules not found, Mac. Cat. 

 194. — On old logs: Leamington, Ont. 



442. Thuidium microphylluiu lignicolum (Kindb.) Best.— Monoicous: 

 tufts yellowish or bright green: stems simply pinnate with few rhizoids and 

 short scarcely ramose paraphyllia; branches close, distichous, attenuate, 

 flexuous or slightly recurved: stem leaves from broad cordate base attenuate 

 to a long often curved point, faintly striate, reflexed on borders; branch 

 leaves shorter, acuminate; all denticulate from middle upward, and papillose 

 at back or on both sides; cells obscure, rounded; costa vanishing in or below 

 apex: capsule cylindrical, arcuate, light brown; teeth pale; cilia long, per- 

 fect; annulus double; lid conical, short apiculate. T. lignicola Kindb. 

 Mac. Cat. 185. — On rotten logs: Ontario and British Columbia, 



443. Thuidium paludosiim elodioides (Ren. & Card.) Best.— Throug- 

 out similar in habit to Elodiuin paludosum; leaves short acuminate, cau- 

 line leaves fimbriate at base; cells shorter, elliptical or oval, papillose. 

 Differs from Thuidium Blandovii by more slender habit: stems more re- 

 motely and less regularly branched: stem leaves narrower; cells looser; para- 

 phyllia shorter; perichsetial leaves narrow, entire, very long subulate: monoi- 

 cous: sterile. Thuidium elodioides R, «fe C, Hedw. 32: 251. 1893. — 

 Hobart, Indiana; New Bremen, Ohio. 



448a. Thuidium Philiberti Limpr. — Plants medium sized, yellow to 

 dark green, in intricate mats; stem 4-8 cm. long, creeping, pinnately 



