TORTULA. 33 



T. fallax. Swartz Muse. Suec. p. 40. Turn. Muse. Hib. p. 48. Engl 

 Sot. 1708. Barbula fallax. Hedw. St. Cr. v. 1. t. 24. T. unguiculata. 

 Turn. Muse. Hib. p. 47. Engl. Bot. t. 2316. (not of Hedw.) T. imberbis. 

 Engl. Bot. t. 2329. Dill. Muse. t. 48. /. 46, 47. 



HAB. On walls, banks, and in fields among grass. 



We know of no plant of this genus that varies so much 

 in the size of the stems as this, so that the dwarfish indi- 

 viduals growing in dry fields would scarcely be believed to 

 be the same as those luxuriant specimens found on the moist 

 banks of rivers. In the former situation, when about half 

 an inch or somewhat more in height it agrees with the T. un- 

 guiculata of Smith ; when an inch and upwards it be- 

 comes T.fallax, and when nearly two inches it is the T. /- 

 noides of Bridel. In the leaves too there is some difference, 

 being in the last-mentioned variety longer and sharper tban 

 in the others. The direction of these leaves is usually re- 

 curvo-patent, and we have never seen them so decidedly re- 

 curved as in the figure of T. fallax in Hedwig's Stirpes. 

 The T. imlerlh of Smith agrees with the most usual ap- 

 pearance of T. fallax. 



9. T. revoluta; stems short; leaves lanceolate, acuminate, the 



margins of those of the stern remarkably revolute ; perichae- 

 tial leaves sheathing, their sides involute; capsule oblong; 

 lid rostrate, shorter than the capsule. (TAB. XII.) 



T. revoluta. Brid. in Schroder s Journ. an. 1800. v. 1. ^.299. Bar- 

 bula revoluta. Mohr. Schwaegr. Suppl. .33. T. nervosa. Engl. Bot. 

 *. 2383. 



HAB. Banks. 



In general habit this approaches very nearly to the T. fal- 

 lax; but differences may be perceived in the remarkable re- 

 volution of the margin of the leaves, whilst in the species 

 last mentioned they are only recurved, and especially in the 

 perichsetial leaves, which in this entirely sheath the lower 

 part of the fruitstalk as in T. convoluta. 



10. T. unguiculata ; stems branched; leaves linear-lanceolate, 



obtuse, their nerve produced into an apiculus, the margins 

 nearly plane ; capsule oblong ; lid rostrate, nearly as long 

 as the capsule. (TAB. XII.) 



Barbula unguiculata. Hedw. St. Cr. v.l.t. 23. Moug. et Nestl n. 27- 

 T. mucronulata. Swartz. Turn. Muse. Hib. p. 47. Engl. Bot. t. 1299. 

 T. aristata. Engl. Bot. t. 2392. Bryum aristatum. Dicks. T. barbata. 

 Engl. Bot. t. 2391. T. humilis. Turn. Muse. Hib. p. 45. Engl Bot. 

 t. 1663. T. apiculata. Turn. Muse. Hib. p. 46. Engl. Bot. t. 2494. 

 Dill. Muse. t. 48./. 48, 49. A. |^ 



HAB. On banks and hedges. 



