46 CRYPTOGAMIA MtlSCI. 



7. T. convoluta, stems short ; leaves lanceolate, rather obtuse, 

 non-apiculate, perichsetial ones nerveless, acute, convolute and 

 sheathing ; capsule oblong ; lid inclined, subulate, nearly as long 

 as the capsule. 



Hab. On banks, rare, in conspicuous soft even yellow- 

 green patches. On a gravelly bank on Lamberton 

 Moor, by the road side, abundant. Spring. 



Very distinct from the preceding. Stems slender, branched 

 with innovations. Fruitstalks long, slender, pale yellow, 

 arising from amongst the new and barren branches. 



21. DIDYMODON. 



1. Z). purpureum, stems erect, scarcely branched ; leaves lan- 

 ceolate, acute, keeled, with entire recurved margins; capsule 

 elliptical, slightly curved, furrowed when dry ; lid short, conical. 

 Dicranum purpureum^ SM. Fl. Brit. 1217. 



Hab. On walls, and more abundantly on dry heathy bare 

 places in moors, in wide brownish tufts. Spring. 



2. D. trifarium, stems erect, simple, or branched with innova- 

 tions ; leaves rather distant, somewhat trifarious, concave, Ian- 

 ceolate, entire ; capsule erect, oblong- ovate ; lid subulate, rather 



long. 



Hab. Moist clay banks, frequent in this neighbourhood on 

 the coast north of the Tweed. On a wet part of the 

 wall between the Old Castle and Spring-gardens. 

 Spring. 



On our sea banks between Spittal and Scrammerston, there 

 occurs in abundance a very small moss, which at first ex- 

 amination I considered to be a variety of D. trifarium. 

 It resembles the small specimens sent from Ireland by Dr 

 DHUMMOND to the authors of the Muscologia Britannica, 

 and delineated in tab. xx. f. 1. of that work ; but Mr AR- 

 NOTT could not discover more than 16 teeth in the fringe 

 on the specimens I sent him ; nor can I, after a careful 

 re-examination of that part, observe more. The moss ap- 

 pears, therefore, to be a species of Weissia, but not re- 

 terrible to any described in any work on British botany to 

 which I have access. 



