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 subapiculatis 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.[1]
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 comprises those terrestrial species of Gymnostomum, exclusive of Physcomitrium, which are of bi-trienmal duration and have monoicous inflorescence.
