thysanothecium descrição do genero

8/3/2019 Thysanothecium descrição do genero

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ON THYSANOTHECIUM. 57

On HYSANOTHECIUM,

ew

enus

f

ichens,

y .

MONTAGNE, .M., nd he EV. . . ERKELEY, M.A., .L.S.

{With a Plate, AB. .) The remarkable production here characterised ormed part

of an extensive collection of Swan River Cryptogams sent to Sir W. J. Hooker y Mr. Drummond. he lder ndivi- duals, hough their affinity to he great ivision f Lichens is very evident, ear a very striking esemblance to antha- rellus ndulatus, r. nfortunately no poridia ave been detected ; he series of specimens is, owever, too perfect to allow of the supposition hat it is merely a trange form f some well known genus.

THYSANOTHECIUM, ont, and Berk. Apothecia erminalia, libere enata, primitus orbicularia plana, margine sinuoso integro, demum flabellari-expansa, obliqua, maxima, obata, obis blongis. iscus andem iraraar- ginatus (excipulo nullo receptus) thallo subconcolor, alli- dus, trato gonimo mpositus. sci mperfecta hallus duplex ; Verrucae sparsee a quibus surgunt frondes verticales tereti-compressae, artilagíneo-corticatee, imoso- plicatse solidae, intus filamentos«.•AB. ad ligna adusta necnon ad terram nudam in regione Australasias, Swan River dicta.

Thysanothecium Hookeri.•rumm. n. 69, 70. The enus has somewhat the habit of Ramalina, to which rt is analogous, n the position of the proligerous lamina and the nature of the thallus, but it is very ifferent in he mode of volution nd he orm f he pothecia. hese re formed at an early period on the tips of the fronds, nd they might then be taken for those of a Stereocaulon. hey may be distinguished, however, by the absence of

n excipulum.

They lose gradually heir orbicular form, nd are developed unequally, o s t ast o ppear ixed o he hallus y a single point f their ircumference, he emainder eing VOL. .



258 EW HEPATKMfi. divided nto flabellate lobes. t s ertainly an nomalous genus, like many others of its compatriots.

The colour varies from a pale yellowish-green, r grey, o brown. he podetia in n. 70 do not exceed 2 lines in height, and the warts f the ower art of the hallus are smaller, while in n. 69 they are sometimes half an inch high. TAB. X.•FIG. . Young, and/. 2 . ull grown plants, nat.

size ; /. 3. young thallus and podetia ; /. 4. lder ditto ; /. 5 . vertical ection f ditto ; /. . odetium ; /. . ortion of apothecium ; /. 8. ditto, more advanced j f. 9. asci ;•ore or less magnified.

New HEPATICLE ; y THOMAS AYLOR, M.D. Having een ermitted y ir William . ooker he

agreeable privilege of examining the Hepaticee f his ost extensive nd aluable ollection, nd llowed he iberty of ublishing he ndescribed pecies, ropose, n he following papers, to give specific characters nd short diag- nostic escriptions f hose hat ppear to me ew. few are added from my private Herbarium and from those ot other kind friends.

1. YMNOMITRION, Nees. 1. G. atrocapil lum, Hook. fil. etTayl.j aule tenuissimo, im - plexo, procumbente, subramoso, flexuoso ; foliis distantibus, erectis, adpressis, concavis, ovato-quadratis, roso-enaargi- natis, ntegerrimis ; perichsetialibus majoribus mbricatis in capitulum congestis.

HAB. On lay, t n levation f 600 eet, oul aven, Kerguelen's Land, May, 1840, Dr. Joseph D. Hooker . Patches loose,

-2 inches wide. Stems black,

lender as

horse-hair, he terile odulose with istant concave a- pressed leaves, whose emarginate summits are browner han the emaining arts; ericheetial stems ale live-brown,



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thysanothecium descrição do genero

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