com- 
1 one 
vatis 
nsch. 
te). 
fertis. 
nent, 
he true 
ellules, 
iles are 
cells of 
species 
tion of 
linis 
riche- 
erecti, 
terstitiis 
recurva, 
ectentia. 
is essen- 
without 
1d those 
sential 
is sicci- 
Gem. 
o in the 
m 
Falklands, etc. | CRYPTOGAMIA ANTARCTICA. 93 
3. SCHISTIDIUM, Bridel. 
Stoma nudum. Calyptra mitreeformis s. campanulato-conica, in lacinias plures subeequales basi fissa, rarius 
integra. Theca æqualis, exapophysata. 
1. ScHistipIum marginatum, Hook. fil. et Wils.; caule erecto, foliis erecto-patentibus lanceolatis sub- 
apiculatis marginatis solidi-nerviis subdenticulatis, theca immersa subrotunda, operculo conico-rostrato erecto. 
(Tas. CLI. fig. VL). 
Has. Kerguelen's Land; not uncommon on moist banks, alt. 500 feet, forming large patches on wet 
rocks, and on the debris of precipices. 
Caules erecti, vix ramosi, 4 lin. longi, ceespitosi, pallide rubri, succulenti. Folia imbricata, erecto-patentia, 
siccitate paulo tortilia, lanceolato-oblonga, subundulata, inferiora spathulato-lingulata, nervo valido rufo subexcurrente 
instructa, rufo-viridia, areolis subquadratis, minutis; perichetialia paulo longiora, angustiora, erecta. Seta theca 
brevior, erecta, fusco-lutea. Zheca ovato-cyathiformis, badia, basi rotundata, ore aperto. Annulus persistens, 
inconspicuus. Operculum conico-subulatum, capsula paulo longius. Calyptra campanulata, apice rufo-brunnea, 
basi pallida, membranacea, demum lacera. Spore minimee, lutescentes. Species dioica ? 
Very distinct from all other described species. 
Pyare CLI. Fig. VI.—1, a tuft of the natural size; 2 and 3, leaves; 4, theca; 5, calyptra :—magmfied. 
4. GYMNOSTOMUM, Hedw. 
Stoma nudum. Calyptra cuculliformis vel ventricoso-subulata, latere fissa. Theca zequalis, exannulata. 
1. Gymnostomum Heim, Hedwig; foliis patentibus oblongo-lanceolatis subconcavis apice denticulatis 
nervo subcontinuo, theca truncato-obovata et oblonga, operculo oblique rostellato columelle insidente. 
G. Heimii, Hedwig, Stirp. Crypt. vol. i. p. 84. t.30. Hook. et Tayl. Muse. Brit. p. 22. t. vii. Pottia Heimii, 
Bruch et Schimper, Bryol. Buropaa.* 
Var. 1, foliis angustis apice vix serrulatis. 
Var. 2, foliis subovato-acuminatis margine pellucidioribus, theca turbinata brevi. 
Var. 8, foliis latioribus obovatis concavis. 
Has. Falkland Islands, var.1 and var. 3 (imperfect) perhaps a distinct species, found near the sea, in 
sandy places. Hermite Island, Cape Horn; var. 1, on maritime rocks; var. 2, on sandy banks. 
Subgenus PuYscomITrRIUM, Bridel. 
2. Gymnostomum (Physcomitrium) Zaxum, Hook. fil et Wils.; ceespitosum, caule simpliciusculo, foliis 
erecto-patentibus laxe imbricatis elliptico-lanceolatis acutis concaviusculis integerrimis reticulatis siccitate 
vix crispatis, nervo sub apice evanido. (Tas. CLI. fig. V.) 
* For the sake of brevity, we omit in this work the generic distinctions proposed by Bruch and Schimper in 
the * Bryologia Europzea’, without, however, intending to question their validity in a natural system. Pottia com- 
prises those terrestrial species of Gymnostomum, exclusive of Physcomitrium, which are of bi-triennial duration and have 
monoicous inflorescence . 
