256 BRYACE^. [Atrichum. 



chlorophyllose, narrowly margined, acutely serrate ; costa 

 nearly round, lamellate ; areolation very close, round-hexagonal. 

 Flowers dioecious, rarely monoecious, the male cup-shaped ; 

 antheridia and paraphyses filiform, Calyptra hairy at the apex 

 only. Capsule oval or cylindrical, cernuous or arcuate. Lid 

 long subulate-rostrate. Peristome of 32 teeth, contiguous to 

 the thick columella. — Catha7'mea, Ehrh. 



1. A. undulatum, Beauv. Stems erect, simj^le or dichoto- 

 mous : lower leaves very small, squamiforin, the ujiper and 

 comal long, narrowly Ungulate, undulate on the borders, his])id 

 on the under surface by transverse rows of small teeth, smooth 

 on the uppei", yellowish margined ; costa narrow, round, with 

 2 to 5 lamellae, spinulose on the under side toward the apex : 

 fruits clustered (1 to 3) : calyptra hispid at the apex, persistent: 

 cajisule long-cylindrical, arcuate or erect, dark brown ; teeth 

 narrowly Ungulate, minutely verruculose, marked with orange 

 lines in the middle. — Prodr. 42 ; Bryol. Eur. t. 410. Bryum 

 nndulatum, Linn. Spec. PI. 1117. Polytrichum undulatum^ 

 Hedw. Muse. Frond, i. 43, t. 16, 17. Catharinea Callibryon^ 

 Ehrh. Beitr. i. 189. 



Hab. In M'oods, on sandy ground ; tops of old standing trunks, along 

 roads, etc. Less common than the following and very variable. 



The species is dioecious, but sometimes the young male plant produces 

 from the centre of the flower an innovation bearing female flowers, and 

 thus the male plant is transformed into a fertile one. 



2. A. angustatum, Bruch & Schimp. More slender 

 than the last, with the narrower leaves more densely areo- 

 late, and serrate at the apex only, the costa 5-6-lamellate : 

 flowers dioecious : capsule nearly erect or subai-cuate, narrowly 

 cylindrical, dark purple, shining ; lid shorter-rostrate ; teeth 

 shorter. — Bryol. Eur. t. 411. Polytrichum angustatum^ Brid. ; 

 Hook. Muse. Exot. t. 50. Catharinea angustata^ Brid. Muse. 

 Kecent. Suppl. iv. 204. 



Hab. Woods and sandy hills, in dryer places than the last; very com- 

 mon. 



3. A. Selwyni, Aust. Differs from the preceding in the 

 broader subspatulate leaves generally obtuse, excavated at the 

 base, the lamellje of the costa (4 to 6) broad, and the calyptra 

 very smooth. — Coult. Bot. Gaz. ii. 95. 



Hab. Northwest coast of British America [Macoun). 



