156 A MAXUAL OF MOSSES 



McKean : Quintuple, July 15, 1896. D. A. B. (Fig- 



ured). 



\\'ashington : Linn and Simonton, (Porter's Catalogue). 

 5. RHODOBRYUM (Schimper) Hampe. 



Dioicous or rarely polyoicous: very robust plants of 

 Mnihm-Wkt aspect, gregarious to loosely cespitose: stem 

 ascending from subterranean rhizome-like stolons; lower 

 leaves remote, mostly scale-like and imbricated, comal leaves 

 large, spatulate, bordered, sharply doubly serrate above, form- 

 ing terminal rosettes ; costa broad, narrowing above and dis- 

 appearing just below apex in most species; leaf-cells rhombic- 

 to elongate-hexagonal, at the base elongate-rectangular; 

 perichsetial leaves smaller, lanceolate, long-acuminate: seta 

 single or in twos or threes, elongate, brownish, more or less 

 hooked at apex; capsule horizontal to pendent, oblong-cylin- 

 dric, slightly arcuate, collum short ; annulus broad and revolu- 

 ble or narrow and deciduous in pieces ; peristome-teeth con- 

 fluent at their insertion, lanceolate to linear-subulate, yellow- 

 ish- to reddish-brown, hyaline above, somewhat bordered, and 

 finely papillose; segments free, yellowish, broadly lance-subu- 

 late, fenestrate to gaping along the keel ; basal membrane 

 high and carinate outwaids; cilia filiform, lohg-appendiculate; 

 spores .014-.024 mm. ; operculum convex-apiculate. 



A widely distributed genus of over 50 species ; 7 species 

 occur in North America, one being in our range.* 



1. Rhodobfjmm ontariense (Kindberg) Paris. 

 {R. roseum Lesquereux and James, Manual, pp., not R. roseum 



[Weis] Schimper*; Bryum ontaricnsc Kindberg). 

 (Plate XX) 



Gregarious to loosely cespitose, deep green : stems erect 

 from long creeping rhizome-like stolons, 2-5 cm. high, stout, 

 with minute appressed bract-like leaves up to the summit, 

 where the leaves suddenly enlarge to form a conspicuous 

 rosette about 1 cm. across ; comal leaves numei'ous, obovate- 

 spatulate from a narrow base, the apex suddenly narrowed 

 and acuminate and more or less twisted, the margin revolute 

 for about three-fourths the length of the leaf and in the upper 

 part prominently sharply spinulose-dentate ; costa strong, 

 mostly plainly excurrent; leaf-cells rather' large, elongate- 

 hexagonal, the walls medium, towards the base larger, thinner- 

 vfalled, more or less hyaline, rectangular: setas 1-3 to a 

 perichsetium, erect, lustrous, castaneous, 2-4 cm. long; capsule 

 pale brownish, oblorig'-cylindrical, about 4-5 mm. long, in- 



*/?. roseum [Weis] Schimper differs in having the costa ceasing below 

 the apex; evidently does not occur in our region, perhaps not at all in 

 northeastern United States. 



