Jennings: Manual of Mosses— 32. Fabroniaceae 279 



ing when moist, rarely secund, more or less concave, unistratcse, non-decurrent, 

 ovate to lanceolate, non-bordered, non-plicate; costa simple, delicate and short, 

 rarely ecostate; median leaf-cells mostly prosenchymatous, smooth, mostly 

 thin-walled, towards the basal angles quadrate to rectangular: capsule exserted, 

 erect, symmetric, oval to sub-cylindric, drying often longitudinally wrinkled 

 and constricted below the mouth, the collum short and thick; peristome deeply 

 inserted, single or double; teeth plane, distantly articulate, non-lamellate, in 

 our genera non-bordered, teeth rarely none; inner peristome none or consisting 

 generally of subulate segments; lid broad, mostly conic and rostrate; calyptra 

 cucullate, naked, smooth, small, fugaceous; spores small. 



Mostly occurring on tree-trunks in warm regions; only 3 genera withm our 



range. 



Key to the Genera 



A. Costa none or very rudimentary; leaves serrulate the whole length ....3. Schwetschkeopsis 



A. Costa plainly evident B 



B. Inner peristome none, teeth short, broad, and blunt; leaves denticulate to ciliate- 



dentate 1- Fabroniu 



B. Peristome double; teeth broadly lanceolate; leaves essentially entire 



2. Anacjmptodon 



1. Fabronia Raddi 



Autoicous, rarely dioicous: stem creeping, partly stoloniform, rarely erect, 

 irregularly branched; branches often partly stoloniform and partly leafy; leafy 

 branches thickly julaceous, the leaves often drying imbricate, sometimes secund, 

 ovate to ovate-lanceolate, mostly subulate-acuminate or piliferous, entire to 

 serrate or even ciliate-Iaciniate; costa mostly delicate and short, sometimes 

 indistinct; median leaf-cells elongate-rhomboid to elongate-hexagonal, the alar 

 quadrate in several series, sometimes not differentiated; inner perichaetial leaves 

 sheathing, subulate-acuminate, ecostate: seta mostly 1-7 mm long, thin, pale 

 yellow, smooth, drying twisted; capsule erect, symmetric, ovate to pyriform, 

 with a short neck, drying plicate, the collum shrinking and the capsule becom- 

 ing cup-shaped to hemispheric, light brown, wide-mouthed; annulus none; 

 peristome simple, rarely none, teeth very hygroscopic, at first united in pairs, 

 later separating, broad, obtuse, often cleft or perforate divisurally, brown, non- 

 bordered, longitudinally striate-papillosc, non-trabeculate; lid conic-convex to 

 low convex, mostly short-rostrate. 



A genus of about 100 species, widely distributed in warm regions, mostly 

 arboreal in habitat, rarely on rocks; 13 species reported for North America; 

 two species in eastern Pennsylvania and perhaps reaching our region. 



Key to the Species 



A. Leaves obscurely serrate 1. R. Ravenelii 



A. Leaves ciliate-dentate 2. F. ciliarif 



1. Fabronia R.^venelii Sullivant 



( F . cjToltniana Sullivant ) 

 Very small, delicate, loosely cespitose, bright green: stems creeping with 



