234 A MANUAL OF MOSSES 



A family of 11 genera, mostly occurring on tree-trunks 

 in warm regions; only two genera within our range. 



Key to the Genera. 

 a. Inner peristome none; teeth short, broad, and blunt. 



1. Fabronia. 

 a. Peristome double; teeth broadly lanceolate. 



2. Anacamptodon. 



1. FABRONIA Raddi. 



Autoicous, rarely dioicous: stem creeping, partly stoloni- 

 form, 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, en- 

 tire to serrate or even ciliate-laciniate ; 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 perichastial 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 becoming cup-shaped to 

 hemispheric, light brown, wide-mouthed ; annulus none ; peris- 

 tome 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—papil- 

 lose, non-trabeculate ; lid conic-convex to low convex, most- 

 ly short-rostrate. 



A genus of about 94 species, widely distributed in warm 

 regions, mostly arboreal in habitat, rarely on rocks ; 13 species 

 in North America; two species in Eastern Pennsylvania and 

 perhaps reaching our region at the east. The two species 

 mentioned may be distinguished as follows : 



Key to the Species. 



a. Leaves obscurely serrate. 1. P. ravenelii. 



a. Leaves ciliate-dentate. 2. P. octoblepharis. 



1. Fabronia ravenelii Sullivant. 

 {F. caroliniana Sullivant). 

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

 creeping with more or less erect branches ; leaves loose, 

 elongate-lanceolate, subulate-acuminate, concave, costate to 

 the middle, entire or but obscurely serrate; median leaf-cells 

 linear-fusiform, the basal and alar quadrate; inner perichaetial 

 leaves ecostate, oblong, short-acuminate: capsule more or less 

 pyriform; the teeth of the peristome brown, 16, approximate 

 in pairs, orange-pellucid, acuminate-deltoid; lid conic, obtuse. 



