Jenn.ngs: Manual of Mosses — 24. Fontinalaceae 177 



half emersed, oval; peristome teeth linear, papillose; trellis of inner peristome 

 perfect with appendiculate cross-pieces; spores more or less muricate, about 

 .012-.015 mm in diameter. 



Various kinds of water habitats, United States and Canada. Not yet 

 reported from our region. 



7. FONTINALIS FLACCIDA Renauld and Cardot* 



Soft, delicate, yellowish green, slender, pinnately divided plants up to 35 

 or 40 cm long; leaves distant (1.5 mm apart), flaccid, concave at base, less so 

 above, narrowly lanceolate to lanceolate, 4-8 mm long, very slenderly acuminate, 

 the apex itself often obtuse to truncate, often denticulate; alar cells much en- 

 larged, hyaline to yellowish-brown, forming quite evident auricles: capsule 

 immersed, subcylindric, 2 mm long; teeth of peristome linear, slightly papil- 

 lose; trellis of inner peristome imperfect, muricate; spores smoothish. 



Reported variously in stagnant or running water in various parts of eastern 

 United States. Not yet reported from our region. 



8. FONTINALIS NITIDA Lindberg* 



Soft, delicate, slender, pinnately divided plants up to 20-40 cm long; leaves 

 about 1 mm apart, flaccid, usually flat, lance-oblong to lance-ovate, gradually 

 acuminate but usually with a short and broad acumen; alar cells enlarged and 

 fairly distinct and often forming auricles: the oval capsule usually immersed; 

 peristome teeth linear, papillose; trellis complete and perfect, muricate, with 

 cross-bars appendiculate; spores finely muricate. 



Asia; and in fresh (non-stagnant) waters, United States and Canada. 

 Not yet reported in our region. 



9. FoNTlNALls DURIAEI Schimper 



Plants soft and weak, green to olive- or yellow-green; stems slender, 10-30 

 cm long, pinnately but bushily branched, often denuded below; leaves about 

 0.5-1.5 mm apart, spreading to erect-spreading excepting at ends of branches 

 where imbricate, plane to sub-concave, lance-oblong to broadly lance-ovate, 

 rather abruptly and broadly acuminate, 3-5 (-7) mm long by 1-2.5 (-4) mm 

 wide; apex acute to sub-obtuse, denticulate to entire; median leaf-cells linear- 

 attenuate to linear-rhombic, .0085-. 017 mm wide; 6-18:1 alar cells more or less 

 enlarged, hyaline to yellowish-brown, rectangular to quadrate or sub-hexagonal, 

 auricles none or indistinct: upper perichaetial leaves oval-suborbicular, broadly 

 rounded at apex to apiculate, lacerate when old: capsules immersed, oval to 

 short-oblong, about 2 mm long with conical op>erculum; peristome brownish 

 orange, the teeth linear, papillose, 0.75-0.9 mm long, frequently united in pairs 

 at apex, with 15-35 lamellae; trellis perfect, muricate, with transverse strands 



complete; spores minutely muricate or smooth, .01 5-. 020 mm in diameter, 

 mature in summer. 



* The descriptions of F. hypnoides, nitida, and flaccida have been largely compiled 

 from Welch's treatment in Grouts Moss Flora. 



