Falkland*, etc.] FLORA ANTARCTICA. 399 



3. SCHTS-TTDIUM, Bridel. 



Stoma nudum. Calyptra mitrseformis s. earnpanulato-conica, in laciniaa plures subaequales basi tissa, rarius 

 integra. Theca aequalis, exapophysata. 



1. Schistidium marginatum, Hook. fil. et "WHs.j caiile erecto, foliis erecto-patentibus lanceolatis sub- 

 apiculatis marginatis solidi-nerviis subdenticulatis, theca immersa subrotunda, opcrculo conico-rostrato erecto. 

 (Tab.CLI. fig. VI.) . 



Hab. Kerguelen's Land; not uncommon on moist banks, alt. 500 feet, forming large patches on wet 

 rocks, and on the debris of precipices. 



Catties erecti, vix ramosi, 4 lin. longi, casspitosi, pallide rubri, succulenti. Folia imbricata, erecto-patentia, 

 siccitate paulo tortilia, lanceolato-oblonga, subimdulata, inferiors spathulato-lingulata, nervo vahdo rufo subexcurrente 

 instructa, rufo-viridia, areolis subquadratis, minutis ; perichstialia paulo longiora, angustiora, erecta. Seta theca 

 brevior, erecta, fusco-lutea. Theca ovato-cyathiformis, badia, basi rohmdata, ore aperto. Annulv.s persistens, 

 inconspicuus. Operculum conico-subulatum, capsula paulo longius. Calyptra campanulata, apice rufo-brunnea, 

 basi pallida, membranacea, dernum lacera. Spor.s mmirnae, lutescentes. Species dioica ? 



Very distinct from all other described species. 



Plate CLI. Tuj. VI. — 1, a tuft of the natural size; 2 and 3, leaves ; \, theca; 5, calyptra : — magnified. 



4. GYMNOSTOMUM, Iledw. 

 Stoma nudum. Calyptra cuculliformis vel ventricoso-subulata, latere fissa. Theca eequalis, exannulata. 



1. Gyhnostomum Heimii, Hedwig; foliis patentibus oblongo-lanceolatis subconcavis apice dentieulatis 

 nervo subcontinuo, theca truncato-obovata et oblonga, operculo oblique rostellato columella? insidcnte. 

 G. Heimii, Hedwig, Stirp. Crypt, vol. i. p. 84. t. 30. Eool: et Tayl. Muse. Brit. p. 22. t, vii. Pottia Heimii, 

 BrucJt et Schimper, Bryol. Europaa.* 



Var. ], foliis angustis apice vix serrulatis. 



Var. 2, foliis subovato-acuminatis margine pellucidioribus, theca turbinata brevi. 



Var. 3, foliis latioribus obovatis concavis. 



Hab. 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 PiryscojiiTiiura, Bride/. 



2. Gymnostomuji (Physcomitrium) laxum, Hook, fil et TTils.; cEespitosum, caule simpliciusculo, foliis 

 erecto-patentibus laxe imbricatis elliptico-lanceolatis acutis concaviusculis integerrimis reticulatis siccitate 

 vix crispatis, nervo sub apice evanido. (Tab. CLI. fig. V.) 



* For the sake of brevity, we omit in this work the generic distinctions proposed by Bruch and Schimper in 

 the ' Bryologia Europaea', 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-trienmal duration and have 

 monoicous inflorescence . 



