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190 D.A.N.Z. ANTARCTIC' RESEARCH EXPEDITION<br />
Thallns grey, under surface usually black ; 'rhizinae uniformly distributed over the whole<br />
under surface; apothecia nsnally substipitate.<br />
Isidia minute, ashy, in centre of thallus; lobes narrow, small . . . . P. kerylcelensis<br />
Isidia absent, soredia present.<br />
Soredia i11 fine white lines along craclrs in the cortex, tips of the lobes truncate, 1-1.5 mm.<br />
broad . . . . . . . . . . . . . . . . P. tenuirima<br />
Soredia coarsely granular, darkening in age on older portions of the thallus; tips of lobes<br />
ronndecl, 2-3 mm. . . . . . . . . . . . . P. Johnstoni<br />
PARMELIA KER~UELENSIS Wilson.<br />
Pan~telia kerglielensis Wilson, 316m. Herb. Boisqier 18, 87; 1900. *<br />
Type: Kergnelen, Royal Sound, Robert Hall, in Nat. Herb., Melbourne Bot. Gard.<br />
Thallns thin, about 125p thick, membranous, loosely attached, glaucous white to milk white,<br />
drying creain bnff, greyish where the cortex is eroded, K- yellow slowly fulvescent, C-, KC-,<br />
sonleu~hat shining, smooth, cortex not craclred, with minute isidia in the centre of the lobes, either<br />
occurring singly or in small, compact groups, tips blackened; lobes very narrow, 0.5-1 mm. wide,<br />
sinuously multifid, tips truncate, intricate, plane, rarely and irregularly subcanaliculate and<br />
imbricate; below black rhizinose, margins not nude below ; upper cortex about 30p thick, a palisade<br />
of hyaline, thick-walled hyphae of isodiametric cells, the uppermost somewhat rounded, imbedded<br />
in a gel ; algal layer abont 30p thiclr of densely packed protococcoid cells 5-7p in diameter ; medulla<br />
up to 75p thick, of loosely woven, mostly periclinal hyphae, about 4p in diameter; lower cortkx<br />
about 20p thiclr of snbspherical cells 4-5p in diameter, imbedded in a black gel; rhizinae about<br />
300p long aiid 50-75p in diameter, very black, of thiclr-walled, conglutinate hyphae. Apothecia<br />
and spermogonia not seen.<br />
Near P. nttitabiZis Taylor, but isidiose above; also near P. sasatilis (L.) Ach. which it resembles<br />
in habit but has smaller dimensions, medulla K- and differs in the nature and distribution of the<br />
isidia.<br />
The type grew over mosses without associated lichens, but a small bit of thallus, too<br />
fragmentary for certain identification, from Long Island was found on a roclr with Steinera nigra.<br />
Kergnelen: Royal Sound, Robert Hall, type (Nat. Herb., Melbourne Bot. Gard.) ; bong<br />
Island, B.A.N.Z.A.R.E. 8953-1.<br />
PARMELIA TENUIRIMA Hook. f. & Taylor.<br />
Parmelia tenuirima Hoolr. f. & Tayl., London Jour. Bot. 3,645; 1844.<br />
Type : Tasmania, J. D. Hooker (Voy. "Erebus & Terroi").<br />
Thallns spreading over mosses and other lichens, lobes slender, branching irregular, subpinnate,<br />
sinuses rounded, ultimate lobes 1-1.5 mm. broad, tips truncate or somewhat rounded, puritan grey<br />
or lighter, margins somewhat ascendant, surface smooth or variously reticulate with minute white<br />
lines from the rupture of the cortex with production of minute soredia; dark brown below, with<br />
scattered tufts of rhizinae covering the whole under surface ; upper cortex 15-18p thick, a palisade<br />
of slender, thin-walled hyphae about 3p in diameter, cutting off spherical brownish cells about<br />
4-5p in diameter, finally decomposing ; algal layer about 50g thiclr of loosely arranged cells of<br />
Prot~cocczcs about 7-8p in diameter with occasional cells deeper in the medulla ; medulla abont<br />
50p thick, of very loosely woven, slender hyphae ; lower cortex dark brown, about 20p thick, highly<br />
gelified but apparently from coarser, periclinal hyphae. Apothecia not seen.
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