Jennings: Manual of Mosses— 31. Hypnacfae 247 



5. Hygrohypnum dilatatum (Wilson) Loeske 



{Hypnum dilatatum Schimper) 



Yellowish-green above, blackish below, the tufts stiff and harsh when dry; 

 stems ascending towards tip and with erect, short, blunt branches; leaves widely 

 spreading, somewhat secund, from a narrower, somewhat decurrent base broad- 

 ly oval-elliotic to almost orbicular, obtuse to apiculate, up to 2 mm long, 

 entire or tamtly denticulate at apex; costa usually faint, forked, rarely reaching 

 mid-leaf, occasionally single; leaf-cells incrassate 10-15:1, towards base 20:1, 

 at apex 2-4:1, the alar cells form a weak group of oval-angular to rectangular, 

 yellowish, thick-walled: seta 1-2 cm; capsule oblong from a narrow neck, 2 mm 

 long, castaneous, constricted below the mouth when dry and empty; annulus 

 2-seriate; lid orange, high convex, with red apiculus; spores ripe in summer. 



On non-calcareous stones in swiftly flowing mountain brooks. Eurasia, 

 and in North America from Canada south to West Virginia and the South- 

 west. To be exoected in our mountains also. 



6. Hygrohypnum novae-caesareae (Austin) Grout 



{Hypnum micaris Wilson, not Swartz; Rhytichostet^ium novae-caesareae Austin; 

 Raphidostegium novae-caesareae Renauld and Cardot) 



Plate LIII 



Small, yellowish-green, glossy, forming wide, thin mats: stems prostrate, 

 very slender, sparsely branching, often flagelliform, the branches short, simple 

 or sparsely branched, sub-erect; leaves spreading or the upper sometimes sub- 

 secund, sub-orbicular, apiculate to shortly acuminate, 0.6-0.8 mm long, serru- 

 late above, concave, the margins somewhat reflexed below; costa double and 

 very faint; median leaf-cells linear, flexuous, about 6-10:1, the apical rhom- 

 boid-oblong, rather incrassate, much smaller than the median, the basal a little 

 shorter and wider than the median, the alar region with about 6 to 10 larger, 

 quadrate to rectangular, rather incrassate cells and with the outermost one to 

 three cells much larger and more or less inflated: the capsules of this species 

 have thus far been found but once, — on damp rocks along Stony Creek, Car- 

 bon County, Pennsylvania, by Francis WoIIe: capsules small with a shortly 

 rostrate lid, the exothecial cells non-col lenchym.atous: dioicous. 



On damp rocks in cool and moist mountain ravines, Eurasia, and from 

 Vermont to western Pennsylvania and Georgia, in the mountains. 



Rare in our region. Favette Co.: Beck Spring, Laurel Ridge, July 26, 1947, and 

 clinging to rock. Blue Hole Creek, Laurel Ridge. July ■>. 1948. C.M.B. McKean Co.: 

 Bennet Brook, July 10, 1898. (figured). 



12. Campylium (Sullivant) Bryhn 



Mostly dioicous: slender, rarely robust, mostly stiffly cespitose, green to 

 yellowish or brownish, drying more or less lustrous; stems creeping to ascend- 

 ing or erect, bushy to variously pinnate; leaves from a shortly decurrent base 

 broadly ovate or cordate, gradually or abruptly narrowed into a long, slender, 

 canaliculate acumination which is mostly strongly squarrose-reflexed, margin 



