Jennings: Manual of Mosses — 29. Leskeaceae 195 



H. Cilia 2-4, nodose to app)endiculate: cells of stem-leaves rounded-angular to long- 

 hexagonal; I 



1. Operculum merely sharply acute: costa of stem-leaves p)ercurrent to excurrent; leaf- 

 margins indistinctly serrate above; apical cell of branch-leaf with a single terminal 



papilla 9. Haplocladium 



I. Operculum distinctly rostrate: costa incomplete to excurrent; stem- and branch- 

 leaves dissimilar; paraphyllia not so felted nor attached to leaf-base J 



J. Margin of stem-leaves entire, base not decurrent; cells uniform, rounded-angular, 



the median with 2-6 papillae on each side 8. Rauia 



J. Margin of stem-leaves entire or toothed above, the base somewhat decurrent; cells 

 mostly uniform, rounded- to oval- or oblong-hexagonal, the median ranging 

 from dorsally unipapillose to both sides pluri-papillose 10. Thiiidtum 



1. Thelia Sullivant 



Dioicous: more or less slender, densely cespitose, yellowish to blue-green, 

 dull; stem elongate, creeping, more or less brown-radiculose, densely-leaved, 

 thickly pinnately branched; branches short, julaceous, obtuse, erect to ascend- 

 ing; paraphyllia various; leaves densely imbricate, either dry or moist, more 

 or less decurrent, spoon-like, broadly ovate, abruptly subulate-acuminate, the 

 margins plane, mostly ciliate-serrate to laciniate; costa short, simple (or 

 forked); cells rhombic, each dorsally with a high and one- to several-pointed 

 papilla; median basal leaf-cells elongate, the alar in several series almost 

 quadrate; inner perichaetial leaves larger, delicate, erect, oblong and subulate- 

 acuminate, with long marginal cilia, costa ending in mid-leaf, areolation 

 elongate, the upper cells uni-papillose above: seta 5-15 mm long, thin, drying 

 twisted, smooth and red; capsule symmetric, erect, oblong to cylindric, golden- 

 brown; annulus none; peristome-teeth basally confluent, narrowly linear-lance- 

 olate, pale, non-bordered, finely papillose, distantly articulate, non-trabeculate; 

 inner peristome pale, papillose; basal membrane low, segments very short or 

 rudimentary, cilia none; lid conic, short-rostrate; calyptra cucullate, smooth; 

 spores small. 



A North American genus of but four species; three species in our region, 

 more common southwards. 



Key to the Species 



A. Papillae on dorsal surface of leaf long, curved, with one fxjint 1. T. hirtella 



A. Papillae on dorsal leaf-surface lower, each with two or more points B 



B. Papillae usually two-pointed; leaves ciliate; mostly on trees 2. T. asprelLi 



B. Papillae usually 3 or 4 pointed; leaves non-ciliate; mostly on rocks or sand 



3. T. LescuTti 



1. Thelia hirtella (Hedwig) Sullivant 



(Pterigynandrum hirtellum Hedwig; Hypnum hirlellum C. Mueller) 



Plate XXXVIII 

 Light green to glaucous-green, small, forming thin and loosely adheren'" 

 mats: primary stems creeping, felted with a reddish-brown tomentum, pinnate 

 with numerous short, crowded, julaceous secondary stems and branches; leaves 

 sub-orbicular, deeply concave, abruptly and narrowly acuminate, decurrent at 

 base, dorsally papillose, the margins plane, spinulose-dentate above, at least 

 in the upper half, fimbriate-ciliate below with usually upturned cilia; costa 



