POTTIOIDEAE. BARBULA: 631 
, : 
conico acuto arcuata, annulo simplici, perist. in membr. 
brevi compluries contorto. 
Patria. Prom. b. spei, prope Zwellendam: Pappe 
1838. 
A B. marginata subaffini notis datis toto. coelo differt. 
66. B. densifolia Hook. et Wils. (Lond. Journ. of 
bot. 1844. p. 543.); dioica; cespitulosa humilis, breviter 
ramosa, densifolia; folia sicca et madefacta erecta haud 
appressa, e basi erecta laxe elongate ampliuscule ple- 
rumque flavide reticulata vix vel parum reflexa longe an- 
gustiuscule lanceolato -acuminata acuta canaliculata, su- 
perne minute areolata opaca viridia maxime tenuiter pa- 
pillosa, margine erecto ubique cellulis, praesertim apice 
folii serrulato, incrassatis elongatis angustis flavidis lim- 
bata, nervo crassiusculo rubente excurrente; perich. con- 
formia; theca in ped. stricto stramineo longiusculo ob- 
longa, operc. subulato, perist. in membrana breviuscula 
compluries contorto. 
Patria. Insulae Falklandi: J. D. Hooker. 
A B. longipedunculata affini notis laudatis, margine 
limbato excepto, longe recedit. 
Obscurae. 
B. leucostoma R. Br. (Suppl. Append. ad iter Par- 
rayan, p. 298.) ; erecta brevis semiuncialis subsimplex; fo- 
lia dense conferta ovato-lanceolata, nervo valido in mu- 
cronulum excurrente, margine integerrimo anguste revo- 
luta, sicca appressa parum torta; theca in ped. terminali 
erecto solitario laevi fusco oblonga aequalis laevis, oper- 
culo conico acuto subobliquo breviori, perist. albo tubu- 
loso. 1. 
Tortula leucostoma Hook, et Gr. Brewst. Edinb. Journ. I. p. 294, 
quo loco auctores perist. tubulosum indicant, quod Brownius e den- 
tibus 32 filif. per paria approximatis dimidioque inferiore trabecu- 
lis connexis supra distinctis apicibus parum tortis compositum de- 
scripsit. —  Zygotrichia leucostoma Brid. Ll. p. 521 et 821. 
Patria. Insula Melville: Sabine. 
