1 



Jennings; Manual of Mosses — 31. Hypnaceae 241 



1. Calliergon cordifolium [Hedwig] Kindberg 



(Hypnum cordifolium Hedwig; Amblystegium cordifolium DeNotaris) 



Plate XLIV 

 Slender, tall, loosely and softly cespitose, green: stems brownish. 10- 

 cm in length; when growing in swamps, more or less erect; when in 

 dryer situations, more procumbent, and furnished with rhizoids; sparsely 

 branched, the branches more or less pinnately branched or simple, cuspidate 

 at the tips; leaves distant, erect-spreading, to spreading, thin, shrinking 

 when dry, large, 2-5 mm long, concave, cordate- to oblong-ovate, entire, 

 the apex rounded and sometimes cucuUate, the base decurrent: costa 

 slender, reaching nearly to the apex; median leaf-cells large, about 

 the apical and upper marginal short and wide, the cells towards th: base 

 gardually becoming large, wide and more or less hyaline-inflated, rounded- 

 hexagonal to rectangular, forming a wide but not distinctly bounded group or 

 band reaching clear across the base of the leaf and quite strongly decurrent; 

 perichaetial leaves erect, sheathing, from an ovate base long-acuminate, up to 

 2.5-3 mm long: seta erect, flexuous, usually 4.5-8 cm long, castaneous, when 

 dry flattened and dextrorse; capsule oblong-cylindric, about 3 mm long, rather 

 turgid-arcuate, inclined to horizontal, castaneous, slightly constricted below 

 the mouth when dry, exannulate; peristome-teeth pale yellow, rather thin, 

 rather long, hayline-margined, strongly trabeculate, the dorsal lamellae hyaline 

 snd papillose above, the basal portion rather irregularly striate, the teeth 

 confluent at base; the segment entire or but slightly carinately split, about as 

 long as the teeth; cilia 2 or 3, slender, nodose, about as long as the segments; 

 the basal membrane about one-half as high as the teeth; exothecial cells incras- 

 sate, rounded-quadrate to rounded-hexsgonal; lid conic, acute to apiculate; 

 spores mature in late spring or early summer, about .012-.015 mm, yellowish, 

 smooth, rather thin-walled. 



In swamps, margins of pools, marshy places, etc.; Europe, Asia, New Zea- 

 land, and in North America from the Arctic region south to New Jersey, 

 Pennsylvania, and Ohio. 



Fairly common in our region and now known from the following counties: Allegheny, 

 Butler. Cambria, Crawford. Erie. Fayette, McKean, Somerset, Warren, and Westmore- 

 land.. Specimen figured: Pymatuning Swamp, near Linesville, Crawford Co., May 18, 

 1905. O.E.J. 



2. Calliergon giganteum (Schimper) Kindberg 



(Hypnum giganteum Schimper) 



Usually robust mosses in wet places or even in deep water, up to 10-30 cm 

 long; rather regularly densely pinnate with irregular branches which are often 

 sharp pointed; stem-leaves up to 4 x 2 mm, plicate and lustrous when dry, 

 decurrent, cucullate at apex, entire; costa wide, vanishing in the apex; median 

 cells linear-fle.xuose, only about .007 mm wide, apical cells wider, alar forming 

 wide abruptly inflated auricles; branch-leaves narrower; seta 5-6 cm long, red; 

 exannulate; ripe in May or June. 



In cold swamps, Eurasia, and from Canada south to eastern Pennsylvania 

 and New Jersey. 



