272 A MANUAL OF MOSSES 



the angles often somewhat larger, rectangular, and sub-inflated, 

 but not forming very distinct nor hyaline patches : seta usually 

 1-2 cm. long; capsule rather turgid, oblong-cylindric, arcuate, 

 inclined ; peristome hypnoid but relatively rather large ; teeth 

 dark orange, cilia 2 or 3, appendiculate, about as long as the 

 entire or slightly parted segments, the basal membrane reach- 

 ing to about two-fifths as high as the peristome ; annulus 2-3- 

 seriate; exothecial cells very much smaller at rim, below be- 

 coming irregular to rectangular, medium-walled; spores 

 minutely roughened, .0il-.014 mm., mature in spring: autoi- 

 cous. 



In swamps, springs, brooks, etc., on bases of trees, roots, 

 stones, etc., sometimes floating ; almost cosmopolitan ; in North 

 America ranging from the Arctic regions to Louisiana and 

 Cuba. Common in our region, in suitable habitats. 



Allegheny : Fern Hollow, August 20, 1906, and Nine- 

 Mile Run, near Swissvale, May 17, 1907. 

 O. E. J. 

 Beaver : Beaver Falls, May 14, 1907. O. E. J. 



(Figured). 

 Center : In swampy spot in gap of Bald Eagle Mt., 



lear Matternville, September 20, 1909. This 

 latter specimen has slenderly acuminate 

 leaves approaching var. longifolium 

 (Schultz) Bryologia Europsea. 

 7a. Amblystegium riparium variety flaccidum (Lesquereux 

 and James) Renauld and Cardot. 

 (Plate XXXVIII) 

 Smaller and of a more slender habit ; leaves more distant 

 and tending to sagittate-lanceolate. 



McKean : East Branch swamp, near Bradford, June 



15, 1895. D. A. B. (Figured). 



2. AMBLYSTBGIELLA Loeske. 

 Autoicous or dioicous : very slender, stems filiform, mostly 

 creeping, irregularly branched; leaves rather laxly disposed, 

 erect-spreading or rarely weakly secund, lanceolate to lance- 

 subulate from a sometimes somewhat decurrent base, slightly 

 concave, non-plicate, margin plane and entire; costa none or 

 very short and weak ; median leaf-cells rhomboid-hexagonal or 

 oblong-hexagonal, 2-4(-8) :1, the basal rather lax, parenchy- 

 matous, the alar quadrate ; inner perichastial leaves erect, basal- 

 ly sheathing, lanceolate to lance-oblong, long-acuminate, 

 ecostate, or with the costa ending in or above mid-leaf: seta 

 5-12 mm. long, drying flattened, yellowish-red to castaneous; 

 capsule mostly erect and symmetric, rarely secund and cernu- 

 ous, obovate to oblong-cylindric, when dry and empty con- 

 stricted below the wide mouth, smooth ; annulus present; peris- 



