318 A MANUAL OF MOSSES 



to Ohio and southward in the mountains to North Carolina. 

 Not yet reported from our region but to be expected, — es- 

 pecially in the more mountainous portions. 



2. Isoptergyium elegans [Hooker] Lindberg. 



(Hypnum elegans Hooker; Isothecium elegans Bridel; Plagio- 



thecium elegans Sullivant). 



Small, densely cespitose, thin, pale shining green: stems 

 branching complanately, the branches slender, partly procum- 

 bent, partly ascending, numerous, usually pointing one way; 

 usually there are also axillary, gemmiferous branchlets ; leaves 

 complanate, sub-distichous, the points usually pointing down- 

 wards, lustrous, little changed when dry, about 1-1.5 mm. 

 long, lance-oblong to ovate-oblong, rather gradually narrowed 

 from about the middle, then abruptly narrowed to a fine, short 

 acumen, the base rounded, non-decurrent, plane-margined, 

 entire except at the acumen where a little denticulate ; costa 

 double and short, faint or sometimes reaching one-third the 

 length of the leaf; median leaf-cells narrowly linear, about 

 20-30:1, about .004-.007 mm., pointed, hardly differentiated at 

 the angles; perichsetial leaves lance-acuminate: capsule turgid- 

 oval, slightly inflated at the curved neck, nearly symmetric but 

 horizontal or sub-pendent by a curve in the upper part of the 

 costa, when dry and empty somewhat wide-mouthed, turbi- 

 nate, costate ; peristome hypnoid, yellow, teeth broadly lanceo- 

 late, blunt, segments entire, cilia 3, rather slender, as long as 

 the segments ; annulus simple ; lid conic, obtusely pointed ; 

 spores mature in spring. 



On rocks or earth in hilly or mountainous regions in 

 woods; Europe, Asia, and from Arctic America to northern 

 United States and south in the mountains to Alabama. Rare 

 in our region. 



McKean : D. A. Burnett. (Porter's Catalogue). 



3. Isopterygium deplanatum (Sullivant) Mitten. 

 (Hypnum deplanatum Sullivant; Rhynchostegium deplanatum 



Schimper). 



Golden-green, lustrous, small, flattened: stems prostrate, 

 irregularly pinnately branching; leaves 2-ranked, imbricate, 

 thin, concave, ovate-lanceolate, gradually long-acuminate, 

 serrulate all around, more sharply so above, plane-margined; 

 median leaf-cells linear, flexuous, prosenchymatous, the basal 

 somewhat larger but very similar; costa none or but very 

 faint: oval-oblong, cernuous, arcuate, plicate when dry and 

 then constricted below the mouth ; peristome hypnoid, seg- 

 ments narrow, cilia 2 or 3, about as long as the segments, un- 

 equal ; annulus none ; spores in autumn, but capsules rarely 

 produced. 



