274 BULLETIN OP THE UNIVERSITY OP WISCONSIN. 



excurrent: perichaetial leaves not ovate-oblong, thin costate: peristome 

 darker red: male flower fixed on side of female. Mac. Cat. 41. Damp 

 and shaded limestone rocks: Owen Sound, Ont. 



108. Blindia acuta flexipes Ren. & Card. Pedicel flexuous, distinctly 

 geniculate. Revue Bryol. 19: 79. 1892. Oregon. 



109. Pottia heiniioides Kindb. Nearly allied to P. Heimii: differs 

 in leaves shorter, the lower obtuse; costa sometimes excurrent: capsule 

 longer and narrower, cylindric; seta golden yellow; peristome present but 

 rudimentary. Mac. Cat. 43. On earth: National Park; Rocky mountains. 



110. Pottia intermedia Fttrn. Scarcely distinguished from P. trun- 

 catula with which it agrees in inflorescence, structure of stem and costa: 

 plants larger, stem erect, longer, lax leaved below, dense above: leaves pale 

 green, accrescent upwards, upper leaves long lanceolate, acuminate, margin 

 re volute from base to middle; costa excurrent into a long yellowish-green 

 point; cells in upper half quadrate or hexagonal, faintly papillose or per- 

 fectly smooth: capsule obovate to almost cylindrical, constricted below 

 mouth when dry and with short, irregular folds; calyptra smooth, cucul- 

 late, covering half of capsule; lid about equaling capsule, obliquely rostel- 

 late; annulus compound, 2-3 rows of cells; peristome rudimentary; spores 

 finely papillose. Limpr. Laubm. 1: 531. On earth: North West Territory. 



111. Pottia littoralis Mitt. Autoicous; resembling P. intermedia, 

 pale below, green or bluish green above: leaves much longer, more erect, 

 sheathing at base, more obtuse, with nerve excurrent in a short point, 

 lower smaller with a long excurrent costa; upper cells smaller, quite smooth, 

 with wall much more incrassate, basal pellucid, very narrow and elongated: 

 seta pale orange red, elongated; capsule oblong oval, slightly narrowed at 

 mouth, ferruginous; calyptra smooth, annulus adherent, of one row of 

 cells; lid rostrate, slightly twisted, oblique; spores ferruginous, scarcely 

 rough. Braithw. Brit. Moss Flora 1: 198. On earth: Yale, B. C. 



112. Didymodon Canadensis Kindb. Differs fromZ>. rubellus princi- 

 pally in perichaetial leaves thinner, from the ovate base abruptly attenuate 

 to a short subulate acumen; borders not reflexed; basal cells very long; 

 costa thinner: dioicous. Mac. Cat. 44. On perpendicular rocks: Rocky 

 mountains. 



113. Didymedon Baden-Powellii Kindb. Dioicous: tufts compact: 

 leaves revolute nearly all around, distinctly dentate: short acuminate, the 

 lower pale brown: perichsetial leaves longer acuminate or subulate, entire: 

 capsules more or less curved; pedicel pale red; lid blunt conic, very short 

 (scarcely capsule). Mac. Cat. 262. St. Paul Island, Behring sea. 



114. Didymodon Hendersoni Ren. & Card. Tufts compact, yellowish 

 above, ferruginous below: stems erect, branched, 1-2 cm. long: leaves 

 crowded, patulous when moist, subincurved, erect-imbricate when dry, 

 ovate or oblong-lanceolate, entire; apex rounded-obtuse or minutely apic- 



