110 HYPNACEAE 



2 — Leaves narrowly triangular-lanceolate, not narrowed to insertion; 

 alar cells at margin all longer than broad; median 5-10: 1. 



minutissima 

 Leaves narrowed to insertion; median cells shorter, alar quadrate. 



confervoides 



A. adnata (Hedw.) Nichols. On stones and base of tree in 

 shaded places, frequent. Summer. 



A. confervoides (Brid.) Loeske. "On limestone rocks, N. J.," 

 Muse. App. 368, Sussex Co. and Hohokus, N. J., Aust., authenti- 

 cated by L. S. Cheney, Bx! 



A. minutissima (Sull. & Lesq.) Nichols. "In old wells, 

 northern part of the state," Geol. Survey N. J. 



Subfamily Entodonteae 



Plants of large or medium size, none minute, typically hyp- 

 naceous; leaves not papillose, often concave or plicate or both; 

 costa lacking or short and double; median leaf cells linear; alar 

 quadrate (in our forms) : seta smooth ; capsule erect, straight, 

 not conspicuously contracted under the mouth when dry; peristome 

 with cilia rudimentary or wanting, segments often narrow and 

 basal membrane sometimes nearly lacking. 



This group has contained a heterogeneous collection of mosses 

 of various relationships, their association being based upon 

 the erect capsule and incomplete peristome. I have shown 

 elsewhere that a degeneration of the inner peristome is associ- 

 ated with erect capsules even though it may not (as I think it 

 is) be a result as well. There is no more reason why Homalo- 

 thecium or Climacium should be placed in this subfamily than 

 there is for doing the same with Brachythecium acuminatum or 

 even Plagiothecium latebricolor . 



Key to Genera 

 1 — Plants robust, glossy yellow-green; leaves symmetric but very con- 

 cave Enlodon 



Plants slender, dark green, rarely glossy 2 



2 — Leaves somewhat falcate, ends of branches curved when dry . . . Pylaisia 

 Leaves not falcate, branches not curved Platygyrium 



ENTODON C. M. {Cylindrothecium B. & S.) 



Growing in wide intricate glossy yellow-green mats; stems 

 densely leafy, turgid with the very concave leaves or in most species 



