Jennings: Manual of Mosses — 28. Entodontaceae 191 



cilia rudimentary or none; spores mostly small; lid conic, short- to long-ros- 

 trate; calvptra cucullate, glabrous. 



Mostly in warmer and temperate regions, on trees, sometimes on rocks or 

 on soil: 14 genera, one genus definitely known from our region. 



Key to the Genera 



A. Leaf-cells smooth 1 . Entodon 



A. Leaf-cells more or less strongly papillose (Pterigynandrum) 



1. Entodon C. Mueller 



Autoicous, rarely dioicous: green to golden-brown: stem prostrate to 

 ascending, complanate-leaved, rarely julaceous, thickly pinnately branched, 

 mostly short, simple, ascending or spreading; stem-leaves compressed, slightly 

 decurrent, concave, the dorsal and ventral imbricate, the lateral spreading, 

 oval, from an ovate base obtuse or apiculate or rarely slenderly acuminate, 

 entire or apically serrate; costa double and very short, or none; median leaf- 

 cells narrowly linear, smooth, and basal lax and incrassate, the alar laxly 

 quadrate and sometimes slightly inflated, forming a distinct hyaline group: 

 seta mostly 1-3 cm long, red or yellow, twisted when dry; capsule erect, 

 straight or weakly curved; collum short; annulate or exannulate; teeth inserted 

 below the mouth, lance-linear, acuminate, thin, plane, mostly non-margined, 

 orange to castaneous, articulate, mostly low-trabeculate; inner peristome with- 

 out prominent basal membrane, segments linear, carinate, yellow, as long as or 

 shorter than the teeth, cilia none; spores .012-. 020 mm. 



Nearly 150 species, on trees and on calcareous rocks, in temperate and 

 warmer regions; about 33 species occurring in North America; 3 species in 



our region. 



Key to the Species 



A. Leaves narrowly gradually accminite; segments adhering to teeth (£. brevisetus) 



A. Leaves acute, abruptly acuminate-apiculate, or almost obtute; segments free B 



B. Teeth with noi less than twenty articulations; leaves acute to almost obtuse; but 



not apiculate. complanate L E. compressui 



h. Teeth with less than twenty articulations C 



C. Leaves acuminat?-apiculate: teeth 15-20 articulate: capsule less than 4.5:1; leaves 



complanate 2. E. cladorhizam 



C. Leaves abruptly apiculate: teeth less than 10-articulate; capsule about 5:1: leaves 



not complanate 3. E. seductriy 



1. Entodon compressus C. Mueller 



(Cylindrotheciiim compressum Bryologia Europaea) 



Plate LXXI 



Widely and flatly cespitose, glossy yellow-green, with compressed stems 

 and branches: considerably more slender than E. cladorh'.zans, but quite simi- 

 lar in general appearance: leaves about 1.0-1.1 x 0.4-0.5 mm, quite concave, 

 broadly oblong-ovate, obtuse to broadly acute, entire at apex; median leaf- 

 cells linear, the alar quadrate and numerous reaching almost across the base 

 cf the leaf, a few on the corner often somewhat inflated; costa none or very 

 rudimentary: seta erect, 1-1.4 cm. long; capsule erect, ovoid to elliptic, narrow- 



