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DODGE-IIICHENS <strong>AND</strong> <strong>LICHEN</strong> <strong>PARASITES</strong> 57<br />
~l~~llus val~yii~g from umbilicate to stipitate; stipe about 0.2 mm. iii diameter, of variable<br />
lIright, composed of fungus filaments exclusively in old plants, expanding into a head about<br />
450~ ill cliameter from which radiate flat folioles about 9Op thick, thinning to 25p at the margin;<br />
ccorticate but the outer laycr of hyphae arid algal gel darker; algae PraJiola, a single layer of<br />
c.chl]s ill tetrads with the loi~g axis of the cell perpei~dicular to the surface of the gel at the margill,<br />
ilisitlc which the clongatc cells form two pairs of tctl-ads, the cclls disapprariiig arid becoming<br />
i1lc.1.oasiiigl~ irregularly arranged tolvard thc head, \\.hela tetrads are rarely seeii; lower slwface<br />
\\it]] rhizinae i~car tlie head, smooth over thc thii~ner portions of the folioles; small splierical<br />
I)r(jl)agl~la or soredia formed on the upper surface containii~g one or two tetrads sul-ro~u~~ded by<br />
11yi)hac and algal gel.<br />
Perithecia immersed in the head, about 200p in diameter, spherical, wall not clearly diffel*entiatccl<br />
from the vegetative hyphae, outer 8p staining nearly black with haematosplin, within<br />
which is a layer about 50p thick of slender densely wove11 somewhat periclinal hyphae imbedded<br />
i11 a gel; thecium of asci and very slender branched and anastomosirig paraphyses which apparclitly<br />
soon disappear in the thecial gel; asci 12-16 X 4-5-55 relatively thick-walled without<br />
tliickened tip, 8-spored; ascospores broadly ellipsoidal, 6-2-8 X 45.5p, unicellular, uninwleate.<br />
Spermogonia in pulvinate swellings of the frond, 375p in diameter and 15r thick, thalline<br />
wall 20-25p thick of periclinal hyphae with occasional pairs or tetrads of algal cells; cavities<br />
ellipsoidal or gyrose about 35p broad, dissepimeiits continuous ~vith the outer wall and of the<br />
same texture, but without algal cells; spermatiophores in a dense palisade lining the cavities<br />
14-16p tall; spermatia bacilliform 2-3 X lp.<br />
On rocks with Kzcttlingeria crozetica..<br />
Kerguelen: Royal Sound, Sta. 62, B.A.N.Z.A.R.E. B126-6; [Observatory Bay,<br />
B.A.N.Z.A.R.E., specimeh without data in Jar 5MC most of which was from this locality].<br />
MASTODIA MAWSONI Dodge, sp. nov.<br />
Type : MacRobertson Land, Cape Bruce, B. A.N.Z.A.K.E. B108-1.<br />
Thallus foliosus, plus minusve orbicularis, lobis rotundis, crispatis, cellulis marginalibus<br />
elongatis, 11-12 x 3+, cellulis centricis qua ternis 3 -5-4. 5p ; medulla hyphis tenuissimis<br />
hyalinis; soredia cellulis quaternis subsphaerica, 8-12p diametro, hyphis paucis in vagina, crassa.<br />
Akinetes algarum 10 X 25p, ellipsoidei cellulis 4-8nis, cylindricis, 8p diametro, 4p longitudine.<br />
Perithecia subsphaerica, muro subbrunneo, tenui. Spermogoilia applanata, muro tenuissimo ; spermatiophori<br />
18-20p altitudine; spermatia ellipsoidea 2-3 X lp.<br />
Thallus foliose, probably umbilicate but attachment not seen, growing over mosses, more or<br />
less circular in outline, lobes rounded and crisped, in some individuals, the upper surface microphylline<br />
probably from the germination of akinetes in situ; marginal cells elongate, 11-12 X 34p,<br />
arranged in a Galisade, other cells in tetrads arranged in rows near the margin, more irregular<br />
within, 3 54. 5p in diameter, with spaces bet ween the tetrads somewhat variable, the whole<br />
imbcdded in a gel; medulla between the upper and lower layers of tetrads, of very slender hyaline<br />
hyphae. Soredia of subspherical tetrads &12p in diameter, with a thick sheath and a few hyphal<br />
filaments; akinetes of the alga long ellipsoid or subfusiform, about 25 X lop of 4-8 cylindric cells,<br />
4p long and 8p in diameter, without hyphae in the sheath.<br />
Perithecia subspherical, immersed, with a light brown wall, too' old and disintegrated<br />
to see contents clearly, but apparently with clavate asci and elipsoidal unicellular spores.<br />
Spermogonia flattened, irregular, wall very thin, palisade of spermatiophores 18-20p tall;<br />
spermatia ellipsoidal, 2-3 X lp.<br />
Unfortunately, our material consists of a few fragments floated out from a tuft of moss<br />
over which ~armeiin Johmtonii was growing. The perithecia are very old and gelified. Such
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