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DODGE-LIOHENS <strong>AND</strong> <strong>LICHEN</strong> <strong>PARASITES</strong> 181<br />
hyphis tenuibus, ramosis, strato extero 15p crassitudine gelifacto; stratum algarum sub thecio<br />
et ad latera thecii; medulla ca. 9OP crassitudine, hyphis tenuibus ramosis anastomosantjbusque, lp<br />
diametro ; parathecium verum hypotheciumque non evoluta ; thecium 45-6OP altitudine ; paraphyses<br />
2~ diametro, furcatae, cellulis terminalibus clavatis vel ellipwideis 7 X 4p, vaginatis; asci sub-<br />
cyclindrici, 35-40 X 7-8p; ascosporae hyalinae, leptodermeae, 2-loculares, i11 asco 7-8 X 3.5-4p,<br />
liberae 10-11 X 4-5p, septis snbconstrictae.<br />
Thallus crustose, uniform, somewhat rimose areolate, surface miiiutely verrucose to glebulose,<br />
grey; ecorticate; algal layer about 100p thick, protococcoid, cells spherical 11-14p in diameter;<br />
medulla enclosing rock crystals, of slender, branched, loosely woven hyphae, about 2p in diameter,<br />
imbedded in a gel.<br />
Apothecia urceolate, up to 1 mm. in diameter, slightly constricted at the base, disc b~fiy<br />
olive to olive, blackening, flat, drying concave, margin slightly elevated, smooth to slightly<br />
crenulate, concolourous with the thallus or lighter ; amphithecial cortex 3540p thick, subfastigiate,<br />
of branched, slender hyphae in a gel, the outer 15p almost completely gelified ; algal layer extending<br />
under and to the top of the thecium ; medulla a%out 90p thick, extending to the top of the thecium,<br />
a very loose network of slender, branched and anastomosing hyphae, about lp in diameter in a<br />
gel ; true parathecium and hypothecium not differentiated ; thecium 45-60p tall ; paraphyses 2p<br />
in diameter, a continuation of medullary hyphae, less branched and not anastomosjng once<br />
dichotomous near the apex, ending in a brownish, clavate to ellipsoidal cell with a sheath, 7 X 4p;<br />
asci subcylindric, 35-40 X 7-8p ; ascospores hyaline, thin-walled, 2-celled 7-8 X 3. 5-4p while still<br />
in the ascus, 10-11 X 4-5p when free, slightly constricted at the septum.<br />
The systematic position of this species is not altogether clear. While the characters usually<br />
used to separate genera, place it in Lecania, the structure of the thallus and apothecia are strongly<br />
reminiscent of Lecanidizsm of the Pertusariaceae.<br />
On rocks with Pyrenodesntia inclinuns and Rinodina peloleuca.<br />
Macquarie Island : Featherbed Flat, B.A.N.Z.A.R.E. B533-1, B533-2, B533-3, B533-4.<br />
TH~NOLECANIA Vainio.<br />
Lecanora subg. llha.ntnolecania Vainio, RBsult. Voy. S.Y. "Belgica," Bot., 16; 1903.<br />
Lecania sect. Thamnolecania Zahlbr. ap. Engler & Prantl, Die Natiirl. Pflanzenfam. I, 1+, 205 ; 1907.<br />
Type : Lecanora Brailmontii Vainio.<br />
Thallus dwarf fruticose, terete ; cortex decomposed an'd gelified; algae protococcoid. Apothecia<br />
lecanorine on the tips of branches, often aggregate and confluent; asci 8-spored; ascospores<br />
4-6-celled. Spermogonia immersed in lateral branches; spermatiophores few septate, branched ;<br />
spermatio filiform, curved.<br />
THAMNOLECANIA ANTARCTICA (Tuckerman, M.S.)'Dodge, sp. nov.<br />
Lecidea (Toninia) antarctica Tnck., in herb.<br />
Lecidea womatica Hook. f. & Taylor, London Jour. Bot., 3,636 ; 1844 : Cryptog. Antarct., 232 ; 1845<br />
mn alimzsm. . .<br />
P Lecidea assimilata Crombie, Jour. Linn. Soc. Bot., 15, 187; 1876: Jour. Bot. Brit. For., 15, 104;<br />
1877: Phil. Trans. Roy. Soc. [London], 168, 50; 1879: Rept. Sci. Res. Voy. "Challenger"<br />
Bot., 1, 2, 237; 1885 : non Nylander, Lich. Scand., 221; 1861.
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