FONTINALIS. 353 



be known by the long nerve reaching the summit or excurrent, 

 which is rarely the case in the Hypnea:. 



Dichelyma differs from Fontinalis in the nerved leaves, in 

 the capsule exserted on a short seta, and in the cilia of the inner 

 peristome united only at their tips, or entirely free, not adherent 

 throughout their length. One species, D. capillaceum B. & S., has 

 been recorded, by Dickson, from Scotland ; but there is too much 

 uncertainty as to the native origin of the specimens to allow the 

 plant, which has never been found since, to be considered a 

 British moss. It somewhat resembles robust forms of Hypnum. 

 fluitans, but is known by the strong, slightly excurrent nerve. 



80. FONTINALIS Dill. 



Leaves nerveless, often tristichous. Inflorescence dioicous. 

 Capsule sessile or subsessile, immersed or emergent among the 

 closely imbricated perichffitial bracts, on a rather elongated 

 perichffitial branch. Calyptra conical ; outer peristome teeth 16, 

 long, linear, entire or perforated, free or united in pairs at the 

 tips, inner a lattice-like cone, open at the apex, composed of 16 

 cilia united by transverse bars. 



Up to the present time there have only been two species of 

 Fontinalis recorded from the British Isles, viz., F. antipyretica 

 and F. squamosa. Recently, however, I sent several doubtful 

 plants to M. Cardot, the well-known authority on the genus and 

 author of the Monographic des Fontinalacees ; and of these two 

 have been determined and described by him as new species, viz., 

 F. Dixoni and F. dolosa (the latter considered here a sub-species 

 of F antipyretica) , two others, F. seriata Lindb. and F. dale- 

 car lica B. & S., being newly recorded for Britain. 



/Ls., at least the lower, folded and keeled at back 2 



: \Ls. not keeled, plane or concave 3. 



/Branch-leaves keeled, somewhat rigid ; capsule almost immersed... 1. antipyretica 

 2 \ Branch-leaves not keeled, plane or nearly so, soft, capsule half exserted.../*. dolosa 



I Ls. shortly pointed ; concave 4. 



3\Ls. longly and gradually tapering 5 



/Ls. usually large, i| lines long or more ; capsule slightly exserted *. squamosa 



4\Ls. small, I line long, narrow ; capsule immersed 2*. dalecarlica 



Ls. wide, ovate-lanceolate, auricles conspicuous 3. Dixoni 



Ls. very narrow, linear-lanceolate, auricles none or faint 4. seriata 



A 



1. Fontinalis antipyretica L. (Tab. XLVIII. D.). 



Stems very long, sometimes attaining 3ft. in length, slender 

 and flexuose, irregularly divided ; the primary divisions bearing 

 somewhat pinnate branches ; the lower part of the stem usually 

 X 



