Daltonia.] D I P L O P E R I S T O M 1. 139 



gard to our valued friend the Rev. James Dalton, by whose 

 muscological communications we have frequently profited during 

 the collection of the materials for the present volume. 



1. D. splachnoides; leaves ohlongo-lanceolate, fruitstalks long, 



calyptra fimbriated at the base. (TAB. XXII.) 



Daltonia splachnoides. Hooker and Tayl Muse. Brit. ed. 1. p. 80. 



Am. Disp. Miftc. p. 54. 



Neckera splachnoides. Engl. Sot. t. 2564. (not of Schwaegr. ) 



HAB. Secawn mountain, near Dublin. Dr. faylor. 



This curious moss has hitherto only been found in the spot 

 above mentioned, by the side of a streamlet, where it grows 

 sparingly, in small, pale, green tufts. The stems are scarcely 

 more than a quarter of an inch in height, slightly branched, 

 branches erect. Leaves rather loosely imbricated, almost erect, 

 of a delicate, nearly membranaceous, structure, faintly reticu- 

 lated, the margins recurved and somewhat undulate, entire; 

 the nerve reaching almost to the point ; those of the perichae- 

 tium are few, small, ovate, concave, nerveless. Fruitstalk 

 lateral, about as tall as the stems. Capsule turbinate, with a 

 small apophysis, which gives it the appearance of that of a 

 Splachnum, whence the specific name. Calyptra mitriform, 

 with a small cuspidate point ; its colour is nearly white, its tex- 

 ture delicate, faintly reticulated; its base cut into a number of 

 fine capillary segments resembling those of Dicranum jlexuosum. 

 Lid conico-rostrate, about as long as the capsule. Peristome 

 large, the teeth pointing in various directions ; the exterior 

 ones reddish brown, the interior pale yellow. 



The plant to which of all others, this doubtless bears the 

 closest affinity, is the Neckera splachnoides of Schwaegrichen's 

 Suppl. t. S%. ( Orthotrichum splachnoides of Bridel ;) but that 

 has altogether the peristome of an Orthotrichum, having the 

 exterior teeth double, and a dimidiate calyptra. 



2. D. heteromalla ; leaves broadly ovate acute, capsule sessile im- 



mersed, calyptra nearly entire. (TAB. XXII.) 



Daltonia heteromalla. Hooker and Tayl. Muse. Brit. ed. 1. p. 81. 



Hook. Fl. Scot. ed. 2. fined. J Hobson, Muse. Brit. v. 2. n. 51. Drum- 



mond, Muse. Scot. v. 1. n. 64. Am. Disp. Muse. p. 55. 



Neckera heteromalla. Hedw. St. Cr. v. 3. t. 15. Turn. Muse. Hib. 



p. 102. Smith, Fl. Brit. p. 1274. Engl Bot. t. 1180. Funck, 



