— 185 — 



decui-rent. Upper leaves densely mamillose-serrnlate nearly all 

 around.- Tufts high compact tomentose, green above. — Swamps 

 in higher alp. region r. Eur. Norway in Galdhoe 1800 metr. 

 a. 6.: I. Hagen, 



90. Dichodontium Schimper. 



A. Leaves obtuse or subacute at apex: perichetial similar 

 but more distinctly sheathing. Male plants in separate tufts; 

 perigonial leaves with percurrent costa. 



l.D.pellucidum L. — Bryum L.; Dichodontium Schimp. 



Leaves channelled from suboblong base sublinear or sometimes 

 ovate-oblong, undulate and scarcely reflexed, us. nearly crowded; 

 inner basal cells narrow hyaline, the others quadrate; costa per- 

 current. Capsule oblique inclined; teeth purpUsh below, orange 

 above; lid rostellate; pedicel long yellowish or pale red. Tufts 

 dark or brown green. Dioecious. Leaves very variable in size. 

 ^- Wet rocks not uncommon. Eur. Norway, Switzerl.! Engl.: 

 Holt. Amer. Can.: J. Macoun; Moser; Waghorne. Alaska: J. M. 

 Macoun. 

 * D.faginiontanum (Bridel as var.) Kindb. as subsp. 



Leaves small subovate-oblong nearly entire: perichetial longer 

 acuminate. Capsule smaller; pedicel short reddish. • — Rocks 

 r. Eiir. Switzerl.! Engl.: Rogers; Cunlifie. Amer. Can.: Macoun; 

 Drummond. 

 2.D.fl[avescens Dickson. — Bryum Dicks. ; Dichodontium Lindb, 



Difiers from the last: Leaves longer and more serrate, less 

 mamiUose, distant. Capsule subsymmetric or symmetric, not 

 or faintly inclined; teeth orange. Tufts not or sparingly radi- 

 culose, bright green or green. Very r. fruiting. ■ — • Wet often 

 submerged rocks r. Eur. Norway fruiting, Germany I Sweden 

 fruit.: P. Olsson. Prance fruit: Lamy, com. Husnot. Amer. 

 Can. fruit.: J. Macoun. Alaska: J. M. Macoun. 



B. Leaves acute at apex; the perichetial much difEerent. 

 Male plants mixed with fertile; perigonial leaves with not- per- 

 current costa. 



S.D.subflayescens Kindb. in Hedwigia 1896 p. 59. 



Leaves channelled from suboblong base tapering to an atte-. 

 nuate acumen, serrate often to below middle, long distant nearly 

 smooth; cells and costa as in the last. Capsule symmetric, 

 erect; teeth dark purplish; pedicel long pale red. Perichetial 

 leaves narrower than the others, long- acuminate and gen. subu- 

 late, in upper part of acumen nearly filled by the percurrent 

 or excurrent costa. Perigonial leaves large long'-aeuminate.^ 



13 



