Jennings: Manual of Mosses — 18. Bartramiaceae 153 



papillose, incrassate, yellowish-brown, about .01 9-. 025 mm, usually mature 

 in June. 



Water-loving mosses usually avoiding calcareous habitat*,, on dripping 

 rocks or in swamps and wet places. Cosmopolitan and occurring in North 

 America throughout, from Canada to Florida, more abundant in the cooler 

 and more mountainous regions. 



Common but only occasionally fruitmg in our region. Known from Allegheny, Arm- 

 strong, Centre, Clinton, Fayette, Huntingdon, Indiana, Lawrence, Lycoming, McKean, 

 Washington, and Westmoreland counties. Thus far this moss has not been found in 

 western Pennsylvania north of the terminal glacial moraine. Specimen figured: Flood- 

 plam of Brush Creek, Douthett. Allegheny Co., April 26, 1908. O.E.J, and G.K.J. 



4a. Philonotis fontana var. falcata Bridel 



Leaves falcate-secund; branches hooked towards the apex. 

 Centre Co.: Matternville Gap, Bald Eagle Mt., July 15, 1909. O.E.J. 



5. Philonotis calcarea (Bryologia Europaea) Schimper, 

 f. occidentalis Flowers 



Plate XXIX 



Densely and softly cespitose, bright green, more or less glaucous above, 

 brownish below: stems long, up to 10-12 cm, slender, erect in the dense tufts, 

 red-brown and densely felted-tomentose below; branches in whorls; leaves 

 dimorphic, stem-leaves ovate-lanceolate, acuminate, about 2-3 mm long, deeply 

 concave, plicate, towards the apex sharply serrulate, towards the base the basal 

 papillae of the cells forming rounded projections, especially on the revolute 

 margins, the margins revolute narrowly towards the clasping and sub-decurrent 

 base, the leaves erect-spreading to secund when moist, shrunken and sub-cris- 

 pate when dry; branch-leaves when moist usually more or less falcate-secund, 

 ovate-lanceolate and narrowly acuminate, about 1-1.5 mm long, by 0.5 mm 

 wide, when dry somewhat shrunken and twisted; costa in both forms of leaves 

 strong, excurrent, dorsally papillose, basal leaf-cells rather thin-walled, rectan- 

 gular, up to .060. 080 x .01 5-. 018 mm, pale, pellucid, towards the margins and 

 upwards lecominp shorter, more incrassate, papillose at the ends, the median 

 and. upper leaf-cells becoming quadrate to 2-4 times as wide as long, strongly 

 papillose at their upper ends, incrassate, pellucid: capsule not seen but said to 

 be large and similar to that of P. fontana ■' perigonial leaves oblong-lanceolate: 

 spores mature in summer, but the capsules rather rarely produced. In vegeta- 

 tive characters this species is difficult to differentiate from forms of P. fontana. 

 Flowers, in Grout (Moss Flora), doubts the occurrence of typical P. calcarea 

 in North America and establishes forma occidentalis to cover our American 

 specimens which seem more or less intermediate between calcarea and fontana. 

 Our specimens seem to belong to the form. 



Uncommon in our region. Clinton Co.: In roadside ditch, north of Renovo, July 

 15, 1908. O.E.J, (figured). Huntingdon Co.: Warrior's Ridge, T. C. Porter. (Por- 

 ter's Catalogue). 



