LICHENS AND LICHEN. PARASITES

DODQELICHENB AND LICHEN PARABITEB
Type : Kerguelen, Swain's Bay and Volage Bay, A. E. Eatoii (Venus Trailsit Exp.).
Thallus thin, wrinkled areolate rimulose, with very narrow blaclr margin of hypothallus, deep
olive grey to olive grey, K-; cortex 4045p thick, decomposed ancl highly gelified u.ith occasional
rock crystals and small colonies of a chroococcoid alga ; algal layer 3540p thiclr of rounded colonies
of Protococcus, cells 4-6p in diameter; medulla about 150p thiclr, of loosely woven, thin-walled
hyphae. Apothecia in low urceolate to chiodectonoid thalline warts, rounded to somewhat irregular,
up to 0.5 mm. in diameter enclosing 14 thecia, separated by thin, slightly elevated margins; discs
somewhat irregular, black ; parathecium hyaline, 75-80p thiclr of vertical slender gelified hyphae
enclosing rock crystals, sometimes more loosely woven aitd then enclosing small air bubbles very
difficult to remove from sections, not sharply differentiated from the medulla below the thecium;
hypothecium scarcely differentiated beyond a more deeply stainiiig area at the base of fascicles
of asci ; thecium about 230p tall ; paraphyses flexuous, slender, dichotomous, tips not thickened
ending in the thecial gel; asci ventricose-clavate, fasciculate, 120-130 X 30-35p, 8-spored ; ascospores
hyaline 30-35 X 18-20p [35-52 X 16-24p Jide Nylander], unicellular with hyaline sheath
about 4p thick.
In the ascus the spores are shorter and broader with deeply staining protoplast, becoming
longer and narrower with non-staining protoplast while still in the thecium after the ascus wall
has disintegrated.
Growing on rocks with Verrucaria obfuscata, Porina inszteta, Xmthopmina kerguebensis,
Lecanactis kergzielensis, Stainera glaucella, Len'decc Azderti, L. Eatoni, L. phaeostonm,
L. submtiw, L. Urbanskyana, Tminia kergzdensis, Rhizocarpm keryuelense, R. urceolinum,
Pertusaria ochrolechioides, Aspicilia endochlora, Lecanma atrocaesirc, Aspiciliopsis macrophthalma,
Placopsis bicolor, Huea diphyella, Buellia ~zhbplica~ta and B. tristiuscda.
Kerguelen: Observatory Bay, B.A.N.Z.A.R.E. B192-25, B192-33, B192-39, B192-40; Greenland
Harbour, B.A.N.Z.A.R.E. B1774, B177-16, B177-36, B17741, B204-5; Royal Sound,
B.A.N.Z.A.R.E. B90-5.
PERTUSAR.IA AUBERTI Bouly de Lesdain.
Pertwaria Aubsrti Bouly de Lesdain, Ann. Cryptog. Exot., 4, 100; 1931.
Type : Kerguelen, basalt plateau west of Port Jeanne d7Arc, Aubert de la Rue 19.
Thallus white, K slowly yellowish, passing to ferruginous, thin, opaque, closely adnate, finely
rimulose, margins olive zonate. Apothecial warts sessile, convex, up to 1 mm. broad, variously
confluent, discs black, scattered, immersed, punctiform, finally surrounded by a slightly elevated
thalline margin; paraphyses branched and anastomosing; asci cylindric-oblong, I intensely blue,
4-spored ; asmspores hyaline becoming smoke coloured, ovoid, oblong or ovoid-ellipsoid, sheath
15cr thick, 140-150 X 69-9OP, thecial gel I-. Spemogonia numerous, black, minute, semi-immersed ;
spermatia slightly curved, 12-13 X 0. 9p.
This species should be easily recognizable by the larger spores, but we have seen no material
referable here.
PERTUSARIA KERQUELANA Zahlbr.
Pertwaria kerguelm Zahlbr., Deutsche Sudpolar Exp., 8,47 ; 1906.
Type : Kerguelen, Sudmire, Werth (Deutsche Sudpolar Exp.) .
Thallus thin, rimulose areolate, between light greyish olive a.nd light drab, K yellowing and
slowly reddening, bounded by a narrow blaclr line of hypothallus; cortex 35cr thick, gelified and
decomposed of more or less periclinal hyphae, enclosing small rock crystals; algal layer 150p thick,