168 A MANUAL OF MOSSES 



11. Mnium cinclidioides ( Blytt) Huebener. 



(Plate XXIII) 

 Lar^e. loosely cespitose, bright green, becoming- dark 



O / L <.j t_* <_5 



when old : stems rigid, under exceptional conditions reaching 

 15 or 20 cm. or more, our specimens sterile and about 4-8 cm. 

 high, stems dark brownish; leaves remote, thin, large, the 

 lower ones ovate to oblong and not at all decurrent. the upper 

 rosulate, widely oblong-lingulate, rounded and obtuse with a 

 minute apiculus, more or less undulate, up to 7 or 8 mm. long 

 and 4 mm. wide in our specimens, margin non-bordered, entire 

 with the exception of occasionally projecting marginal cells; 

 costa ending considerably below the apex; leaf-cells rhomboid- 

 hexagonal, arranged in series radiating from the costa, the 

 marginal gradually becoming linear and parallel to the margin. 



^5 O / <J 



all rather thin-walled, chlorophyllose, the largest up to about 

 .030X-100 or .110 mm.: seta long, rather slender; capsule 

 abruptly pendent, shortly oval ; lid conic-apiculate ; peristome 

 brownish : dioicous : mature in summer. 



In bogs, pools, and swamps in the cooler parts of Europe, 

 Asia, and North America down to Xew Jersey and Pennsyl- 

 vania ; generally sterile. 



Crawford : In Pymatuning Swamp. Linesville, Tune 



12, 1905. O. E. J. (Figured). Sterile. 



MoKean : Sphagnum Swamp, West Branch, July 



5. 1896, and July 22. 1894. D. A. B. 



Sterile. 



Family XVI. AUL A C O M N I A C E A H. 



Dioicous, rarely autoicous : robust to slender, more or less 

 high-cespitose : stem mostly with a central strand, with one to 

 three innoyations below the apex, also with slender sterile 

 shoots from the older portions ; leaves 8-seriate, gradually 

 larger above, carinate or concave, ovate or oblong to lanceo- 

 late or lance-linear, acute to obtuse, non-bordered, mostly 

 toothed above; costa mostly incomplete, with median guides; 

 areolation small, rounded, incrassate, mostly papillose; sporo- 

 gonia solitary ; seta usually long, erect ; capsule cernuous, rare- 

 ly erect, oblong to cylindric, with a short collum, more or less 

 8-striate, plicate when dry ; annulus present ; exothecial cells 

 elongate to rectangular, the longitudinal walls thickened ; 

 phanerophore, stomata in the collum on-ly ; peristomes free and 

 essentially as in Bryinn; spores .008-.014 mm. ; operculum conic to 

 rostrate; calyptra narrowly cucullate. long-rostrate, split on 

 one side, fugacious. 



Inhabiting the colder and temperate parts of the world, in 

 moist habitats on soil, rocks, trees, etc. The genus Lcptotlicca 

 with two species in the south temperate zone and the following: 



