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; annnlns 2-3- 

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

 coming irregular to rectangular, medium-walled ; spores 

 minutely roughened, .011-.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. 



7 a. 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. AMBLYSTEGIELLA 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- 



