OF ARTS AND SCIENCES. 277 



25. T. iNVOLUTUM {sp. nov.) : dioicum dense ca3spitans caule 

 subsimplici densifolioso ; foliis lineari-lanceolatis e basi brevi erecta 

 horizontali-recurvis involuto-concavis marginibus angustissime inflexis, 

 costa cum apice evanida ; capsula cylindracea in pedicello breviusculo 

 erecta ; operculo conico-rostrato ; perist. dentibus brevissimis erectis 

 plus minus irregularibus bifidis vel pertusis. — On rocky ground. — 

 Stems tliick, 3-4 lines high ; pedicels about the same height ; foliage 

 very dark green. The main characters of this species are, the imper- 

 fect peristome, and the strong involution of the leaf, which, when flat- 

 tened, is of a broad elongato-lanceolate outline. 



26. T. INVOLUTUM, var. statura minore, foliis fusco-flavescentibus 

 minus divergentibus. — In similar localities. 



Gen, BARBULA, Hediv. 



27. B. GRACILIS, Schwcegr. ; Bryol. Europ. 1. 145. — On wet, rocky 

 banks. 



28. B. AGRARiA, Swartz ; Doz. et Molkh. Prod. Bryol. Surinam, p. 

 15, t. 8. — Rocks, and dry, sandy places ; common. 



29. B. LINEARIS, Swartz; Schwcegr. Suppl. t. 30.- — Moist, rocky 

 ledges. 



30. B. Crugeri, Sond. ; Mall. St/nop. 1, p. 618. — Banks of earth 

 in coffee-fields. 



31. B. OBSCURA (sp. nov.): dioica ; csespite arctius coh^erente ; 

 caule gracili fastigiato-ramoso laxifolioso ; foliis recurvo-patentibus e 

 basi oblonga sensira longe lineari-acuminatis ad apicem costatis sub- 

 tortilibus ; capsula elongato-cylindracea curvula ; operculo conico- 

 subulato. — Dry banks. — Near B. gracilis, but has less crowded 

 and more spreading leaves, not tapering so suddenly from the base, 

 nor reflexed on the margins. The capsule is longer and slightly 

 curved. 



32. B. suBULiFOLiA (sp. nov.) : dioica laxe ctespitans ; caulibus 

 gracilibus erectis dichotome ramosis ; foliis laxis erecto-patentibus 

 strictis e basi ovato-lanceolata sensim in subulam longam costa valida 

 fere impletam productis ; capsula cylindracea erecta ; operculo acicu- 

 lari. — Wet rocks, along mountain rivulets. — Resembles B. campylo- 

 carpa, Tayl., but has a straight and shorter capsule, and leaves with a 

 more predominant costa. 



33. B. MNiiFOLiA {sp. nov.) : dioica laxe coespitosa ; caule humili ; 

 foliis laxis moUibus patulis pellucidis e basi oblonga carinato-concava 



