142 DIPLOPERISTOM1. [Fontinalis.. 



where the motion of the water was rapid. In Lough Bray, in 

 Ireland, F. antipyretica only is found, and in the stream which 

 issues from it and tumbles down the steep side of the moun- 

 tain, only F. sqiiamosa, yet they both bear fructification. 

 3. F. capillacea ; leaves furnished with a nerve slightly concave. 



(TAB. XXII.) 



Fontinalis capillacea. Dicks. PL Crypt. Fasc. 2. p. 1. Smith, Fl. 



BriL p. 1337. Engl Sot. t. 2432. Schwaegr. Suppl v. 1. P. //. p. 



307. Brid. Meth. p. 186. Arn. Disp. Muse. p. 70 DM. Mmc. t. 



33. f. 5. Hook. Fl. Scot. P. II. p. 139. 



HAB. Alpine rivulets. Mr. DicJison. 



With this species we are but little acquainted, having 

 only seen it in Mr. Turner's rich Herbarium, and, like the 

 last described, communicated by our great cryptogamist, Mr. 

 Dickson. In the specimens there preserved, the stems are 

 from two to three inches long, but evidently broken, so that 

 they can give no just idea of the length, which Dillenius re- 

 presents as a span or more, branched. The leaves are subse- 

 cund, especially towards the extremity of the branches, of a 

 brownish green colour, long-subulate, concave, or a little 

 carinate, furnished with a strong nerve. Perichsetium half an 

 inch in length, lateral, arising from the lower part of the stem 

 or branches ; its leaves very long and sheathing. No fructifica- 

 tion in a more advanced state has been found on Mr. Dickson's 

 Scotch specimens ; but Dillenius, whose Pennsylvanian plants, 

 above referred to, are considered to be the same, thus describes 

 the perichsetia and capsules : " e foliorum alis, prsesertim qua 

 rami egrediuntur, calyces enascuntur longi, styli instar porrecti, 

 ab initio convoluti et cuspidati, postea in squamas membranaceas 

 oblongas latiusculas pellucidas in summitate dehiscentes, e 

 quibus capsulae prominent exiguse, oblongo-rotundse, operculo 

 cuspidato terminate, virides, per maturitatem subfuscse, exili- 

 bus ciliis coronatae, setis e calyce vix prominulis, per vaginam 

 tamen seu calycem ad basin usque pertingentibus." 



Dillenius compares his fine specimens to Hedwigia aquatica. 

 Dickson's specimens are much smaller and slenderer, and we 

 sometimes think that that author may have gathered large 

 aquatic specimens of Weissia acuta without fructification, and 



