TWENTY-SEVENTH ANNUAL MEETING. 165 



Leaves thick and coriaceous. 



[Oi'thotricliuin aud Ptychomitrium (S. Notarisia) may bo found liere.] 



J J Teeth sixteen; calyptra mitrate. 



Calyptra plicate. 



Teeth cribrose, purple x Coscinodon, 154 



Teeth filiform, trifid Ptychomitrium, 156 



Teeth approximate or connate in pairs. 



Lanceolate to subulate, papillose Ptychomitrium, 156 



Triangular lanceolate, articulate quadrate. 



Basal leaf-cells hexagono-rectangular, hyaline * Orthotrichum, 164 



li II Calyptra not plicate. 

 Terrestrial, or on rocks. 

 More than 1 cm. high: leaf-cells small, quadrate or punctate, 

 obscure; beak long or short, not clavate. 

 Teeth lanceolate, flat, subentire or cribrose, or 2-.3-fid to the 



middle * Grimmia, 134 



Teeth linear-lanceolate, 2-3-fid to below the middle, or 



cleft to base into filiform segments Rhacomitrium, 147 



X t X Teeth sixteen; calyptra cucullate. 



II Leaves distichous. 

 Leaves broad, with a prominent vertical wing * Fissidens, 81 



II II Leaves pluriseriate. 

 ^ Caf)sule unsymmetric, cernuous-inclined, or arcuate. 



Teeth filiform, bifid from a membranous base x Desmatodon, 110 



Teeth irregularly lacerate or bifid to the middle or below. 

 Leaf-cells enlarged at the basal angles, oblong above, rectan- 

 gular at base * Dicranella, 64 



Leaf-cells enlarged quadrate at the basal angles, linear at base, * Dicranum, 67 



Leaf-cells of two kinds, in two or three layers * Leucobryum, 90 



Teeth bifid to near the base. 



Lid conic, leaves lanceolate * Ceratodon, 92 



^ •] Capsule symmetric, pendulous on a flexuous pedicel. 

 Teeth bifid to the middle x Campylopus, 77 



]! Tl Tl Capsule symmetric, erect. 

 Teeth bifid to the common membranous base. 

 Leaves subulate to lance-subulate, from a broader base .... * Leptotrichum, 105 

 Leaves lanceolate to linear-lanceolate. 



Lid elongated-conic x Trichostomum, 108 



Lid short-conic or beaked x Desmatodon, 110 



Leaf-cells not enlarged at the angles. 

 Teeth large, mostly cribrose. 



Pedicel little longer than the often hair-pointed leaves * Grimmia, 134 



Teeth small, often truncate or rudimentary; leaf-margins involute 



above * Weisia, 55 



Teeth entire. 



Capsule oval to subcylindric, not ribbed when dry; teeth 



linear-filiform, connate at base x Didymodon, 104 



Capsule short-pyriform, turbinate when dry; teeth blunt Seligeria, 96 



Capsule globose; lid beakless, small * Bartramia, 203 



