280 American Midland Naturalist Monograph No. 6 



more or less erect branches; leaves loose, elongate-lanceolate, subulate-acumi- 

 nate, concave, costate to the middle, entire or but obscurely serrate; median 

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

 erostate, 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; spores about .017 mm in diameter. 



On bark of trees, rotten logs, etc., extending from the South up into south- 

 eastern Pennsylvania. 



2. Fabronia ciliaris (Bridel) Bridel 



(F. octoblepharis Schwaegr.; F. pusilla Schwaegr.; 

 Pterogonium octoblepharis Schleicher) 



Small, delicate, thinly cespitose: stems creeping with erect branches; leaves 

 lance-ovate, filiform-acuminate, thin, green, spreading, sometimes 2-ranked, 

 coarsely and irregularly lacerate-dentate on the border the acuminate tip con- 

 sisting of a single elongated cell, costate to considerably above the middle, 

 non-plicate, plane-margined, closely imbricate when dry; median leaf-cells thin- 

 walled, linear-rhombic to hexagonal, about 3-5:1, the basal clear across the 

 lower one- fourth or one-fifth of the leaf quadrate or sub-quadrate: seta rather 

 long; capsule oval, neck rather distinct, the urn erect, symmetric, more or less 

 contracted below the mouth when dry and empty; peristome single, with the 

 teeth united in pairs, dark brown, recurved when dry, when old more or less 

 bifid; spores mature in spring, about .015 mm in diameter. 



On rocks and trees from New Jersey throughout the Central States to 

 Minnesota and southwards. Occurs in southeastern Pennsylvania and may 

 reach the southern part of our region. 



2. Anacamptodon Bridel 



Autoicous: mostly densely cespitose, dark green, when old brownish to 

 yellowish, lustrous: stem long-creeping, densely radiculcse; the branches short, 

 densely-leaved, erect to ascending; leaves spreading, often secund, ovate to oval, 

 long-acuminate, entire; costa strong, ending above the middle of the leaf; leaf- 

 cells rich in chlorophyll, elongated rhombic-hexagonal, the basal rectangular; 

 inner perichaetial leaves elongate, not sheathing, generally acuminate, thinly 

 costate; seta 5-8 mm long, quite thick, straight, smooth, red to dark castaneous, 

 drying twisted; capsule erect, symmetric, oval, short and thick-necked, drying 

 strongly constricted below the mouth, smooth; annulus broad, delicate but 

 persistent; peristome double, deeply inserted, the teeth strongly hygroscopic, 

 apically united in pairs, broadly lanceolate, pale brown, divisural line almost 

 straight; teeth articulate below, densely finely papillose: basal membrane of 

 inner peristome none, the segments filiform, somewhat shorter than the teeth, 

 non-carinate, brown, almost smooth; lid conic-convex, straight or obliquely 

 rostrate; spores about .008. 010 mm. 



A genus of 7 species of which 5 are confined to Asia. The following 

 occurs in Europe and eastern North Ameria: 



