FABRONIACEAE 113 



P. Schimperi R. & C. (P. intricala B. & S.). Frequent on 

 apple and shade trees beyond city conditions. Autumn. 



P. subdenticulata Schimp. "On bases of white oaks about 

 Closter, N. J.," Muse. App. 290. " Richmond Hill," Flora L. Id. 



Family 23. FABRONIACEAE 



Smallest and most delicate of the Pleurocarpi except Am- 

 blyslegiella. Mostly plants of warmer regions, growing in 

 rather thin tufts, often glossy. Stems without central strand, 

 creeping, producing many erect and simple or somewhat divided 

 branches; paraphyllia lacking; branches densely leafy; leaves 

 soft, rarely or not at all complanate or secund, closely imbricate 

 when dry, not decurrent or plicate, ovate to ovate-lanceolate, 

 acuminate, entire in some species, ciliate-dentate in others; 

 costa lacking or single and extending y 2 length of leaf; leaf cells 

 thin-walled (except Habrodon) , median linear-rhombic to hexag- 

 onal; basal and alar often quadrate to short rectangular; none 

 papillose; capsule erect and symmetric, cylindric to ovoid, 

 often strongly contracted under the mouth when dry and empty; 

 peristome single or double, the outer 16 teeth often united in 

 pairs and reflexed as in Orthotrichum; segments of inner peri- 

 stome, when present, narrowly linear. Rare in our range, 

 usually on trees. 



Key to the Genera 



1 — Leaves ciliate-dentate Fabronia 



Leaves entire 2 



2 — 3 or 4 rows of quadrate to rectangular basal cells; peristome 



reflexed when dry Anacamptodon 



Roundish-quadrate cells extending well up leaf margins .... Clasmatodon 



ANACAMPTODON Brid. 



A. splachnoides (Froelich) Brid. Our only species, dark 

 green; leaves ovate-lanceolate, acuminate, entire; leaf cells 

 rhombic-hexagonal, quadrate to rectangular at base: seta 

 5-8 mm. long, annulus lacking ; peristome double; teeth approaching 

 each other in pairs and reflexed when dry; segments filiform with 

 no basal membrane; spores papillose, maturing in June. Moist 



