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DODGE--LIOHINS <strong>AND</strong> LIOHEN <strong>PARASITES</strong> ,256<br />
more or less periclinal hyphae; thecium about 90p tall; paraphyses slender, dichotomous, tips<br />
swollen, cutting off black, spherical cells, epithecium dark fuliginous, 8-lop thick; asci cylindric,<br />
tip greatly thickened, protoplast rounded, disappearing early leaving groups of maturing spores<br />
in the thecial gel ; ascospores dark brown to blaclr, remaining unicellular until the wall is very darlr,<br />
finally 2-celled, very broadly ellipsoidal, not or rarely constricted at the septum, 9-11 X 6-7p.<br />
The groups of apothecia are evidently formed by proliferation of the edge of the hypothecium.<br />
the original parathecium disappearing.<br />
$<br />
On rock with TmOniznia J~hn~stoni.<br />
Queen Mary Land : Possession ~unatRk, C. T. Harrison, A.A.E. 76.<br />
RINODINA Gray.<br />
Rinodina S. F. Gray, Nat. Arr. Brit. P1. 1, 448 ; 1821, emend. Mass., Ricerch. Autonom. Ilich<br />
Crost., 14; 1852.<br />
Lecanora subg. Rimdim Ach., Syn. Lich., 146 ; 1814.<br />
Dimelaena Norm., Nyt Mag. Naturvidensk., 7, 231; 1863 (p.p.min.).<br />
Rerengeria Trev., Riv. Period. Lav. Accad. Padova, 265 ; 1851-2.<br />
Pleoriks Clements, Gen. Fung., 84; 1909.<br />
Merorinis Clements, Gen. Fung., 84; 1909.<br />
Dictyon'nis Clements, Gen. Fung., 84; 1909.<br />
Type : Rimdim sophodes (Ach.) S. F. &a y. For discussion, see Dodge & Baker, Am. 1x0.<br />
Bot. Card., 25, 655 ; 1938.<br />
Thallns crustose, rarely squamulose, uniform or with effigurate margin (in sect. Beltramircia),<br />
attached to the substrate by the hyphae of the prothallus or of the medulla, without rhizinae;<br />
ecorticate or with fastigate cortex, or in the higher forms with a palisade of pseudoparenchyma; ,<br />
algae protococcoid ; med.nlla of loosely woven, thin-walled hyphae. Apothecia circular, immersed<br />
or sessile, lecanorine, but in some species the algae finally disappear from the amphithecium ; para-<br />
thecium thin or absent; epithecium dark or black, horny or pulverulent, usually K purple or<br />
violet; hypothecium hyaline, rarely dark; paraphyses filiform, seldom forked, more or less geli-<br />
fied, usually capitate; asci normally 8-spored, rarely up to 24-spored; ascospores smoke grey, brown<br />
or black, 2-4-celled, wall very thick, protoplasts commonly united by an isthmus. Spermogonin<br />
immersed or in warts, irregularly flask-shaped; spermatia small, elongate, straight.<br />
R~NODINA ASPICILINA Zahlbr.<br />
Rinodina aspicilinu Zahlbr., Deutsche Siidpolar Exp., 8, 50 ; 1906.<br />
Type : ~er~uelen, Pinguinbucht, Werth (Deutsche Siidpolar Exp.) .<br />
Thallus thin, areolate, rimose, pale ochraceous to dark olive buff and dark olive, determinate,<br />
but not bounded by a dark line; cortex 25-30p thick, more or less decomposed, but apparently fastigiate,<br />
cells more or le~s isodiometric ; algal layer about 75c( thick, of closely packed, protomcoid<br />
cells, about 7p in diameter; medulla about 75p thick, of more or less vertical, compact hyphae.<br />
Apothecia immersed in the areoles, often nearly covering them, 0.3-0.4 mm. in diameter, disc<br />
black, dull, slightly concave at first, then plane; amphithecium and parathecium not differentiated<br />
from the thallus; hypothecium 75-90p thick in the centre, thinning toward the margin, scarcely<br />
differentiated from the medulla, the upper 35p more deeply staining, of slender, subvertical<br />
hyphae; thecium 75-85p tall; paraphyses very slender, scarcely septate, dichotomously branched<br />
above the asci, tips brown, clavate 7-8 x 3p, or finally moniliform, cutting off spherical cells in
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