22. Pterygoplij'llum Biidel. 

 l.P.lucens L. — ^ Hypnum L.; Pterygophyllum Brid. 



Leaves plane very large, round-ovate or suboval, arrounded 

 at apex, pale-hyaline when emarcid; upper cells round-hexago- 

 nal, lower oblong. Perichetial leaves ovate-lanceolate acummate. 

 Capsule suboval horizontal or defiexed; teeth orange; segments 

 orange entire as high, their basal membrane high; lid rostrate; 

 pedicel long red. Tufts loose. Stem irregularly divided. Mo- 

 noecious. Habit of Mnium pundatum. — Wet places princ. 

 near rivulets. Eur. France: Zetterstedt. Italy: Arcangeli. Austria: 

 Schmidt Germany: Huebner. Engl.: Cash; Holt. Norway: Ahn- 

 feldt, com. S. Hardin. Amer. Pacif. distr. Alaska: J. M. Macoun. 

 Can,: J. Macoun. 

 2.P.Sullivaiitii C. Mueller. — Hookeria Lq. et Jam. 



Differs from the last: Leaves ovate or suboblong narrower 

 and less large subacuminate subacute; cells oval-oblong nearly 

 uniform. Capsules unkno\vn. — Rocks r. Amer. U. S. Tennessee: 

 Mrs Britton, com. C. Mueller. 



23. Daltonia Hooker et Taylor. 

 l.D.splacbnoides Smith. — Neckera Sm.; Daltonia H. T. 



Leaves small entire from sublinear-lanceolate base tapering 

 to a subsubulate shorter acumen; middle and lower inner cells 

 oblong-lanceolate, marginal narrow-linear yellowish; costa reaching 

 to acumen. Capsule small oval-oblong; teeth whitish or yello- 

 wish; segments entire as long without basal membrane; lid 

 yellow rostrate; pedicel short. Plants small. — Rocks and 

 trees r. Eur. Irel.: Holt; M'Ardle. 



Fam. 9. LeskeacGSB. 



24. Thelia SuUivant. 



A. Leaves green fimbriate; their cilia not split. 

 l.T.hirtella Hedwig. — Pterigynandrum H.; Thelia Sull. ic. m. 



Stem brown-tomentose; branches bilateral distant; paraphyllia 

 numerous. Capsule subcylindric; teeth short; segments none; 

 endostomial membrane elevate; lid rostrate; pedicel short. — • 

 Trees r. Amer. Can.: Macoun; Drummond n. 79; Lawson. U. S.: 

 Roell; Sullivant, com. C. Mueller; com. Macoun and Cardot. 

 2.T.robusta Duby. 



»Difiere from the last: Branchlets unilateral very crowded. 

 Leaves r. simply costate. Endostomial segments obtuse. — 

 Amer. r. U. S.»: Lesq. et Jam. 

 3.T.conipacta Kindb. in Ottawa Naturalist IV. 



