LICHENS AND LICHEN. PARASITES

DODGE-LICHENS AND LICHEN PARASITES 89
Type : Kerguelen, Royal Sound, 0bservator)- Ray, A. E. Eaton (Venus TI-ansit Exp.).
Thallus thin, 160-190p thick, white, limited by a black hypothallus, determinate, margins
slightly lobate, surface smooth or nearly so, mi~~utely rimosc; cortcx about lop thick of pcriclinal,
gelified hyphac; algal layer 75-100p thick of protococcoicl cells about 6-lop in diameter with thick
gclified walls; medulla of slender, densely wove11 hyphae. Apothecia semi-immerscd to sessile,
black, 0-6-0-7t( mm. in diameter, margin prominent, disc plane to slightly concave, black; parathecium
carbonaceous, 10&120p thick cstel~ding about onc third the distance under the hypothecium,
the central third under the hypothecium thinner, pale brown to almost hyalii~e and
merging with the mcdulla below and thc hypotlleciunl above; hypotheci~~m hyaline, 35-50p thick,
of periclinal, loosely woven hgphac, passing into subvertical hyphae above and not sharply
differentiated from the thecium ; thccium 50-60p tall ; epithecium bluish ; paraphyses slender,
hyaline, once or twice branched in the upper third, tips uot enlarged, imbedded in the thecial gel;
asci clavate, 50 X 10-12p, tip thickened, protoplast umbonate; ascospores ellipsoid, hyaline, wall
rather thick, nucleus and protoplasmic strands staining deeply and simulating a septum,
10-12 X 6-7p.
On rock with 17errzicaria obfzucata.
The above description is based on B.A.N.X.A.R.E. B2069. The thallus of B177-2 appears
somewhat thicker bnt the surface is badly eroded and the marginal lobules appear somewhat
more prominent. Zahlrbuckner, Deutsche Siidpolar Esp., 8, 27; 1906, describes spermogonia
from Station lake, Urbansky, as immersed, spherical with black apex, wall fuliginons, dimidiate;
spermatiophores densely fasciculate, subfiliform 17-18p long; spermatia nearly straight to
moderately or strongly curved and hamate, 17-23 X 1p.
Kerguelen : Greenland Harbour, B.A.N.Z.A. R.E. B177-2, B204-9.
Heard Island : between Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. B140-22.
LECIDEA SUBAWENTIENS var. BRACIIYBASIDIA Zahlbr.
L, subusse~ttiens var. brachybasidia Zahlbr., Deutsche Siidpolar Exp., 8, 37; 1906.
Type : Kerguelen, cliff wall on the Siidmire, Werth (Deutsche Siidpolar Exp.) .
Apothecia larger up to 1 mm. broad, epitheciurn olive, blackening. Spermogonia as in the
typical species, spermatiophores short, 8-9 X 2-3p, ampullaceo-cylindric; spermatia variously
curved or hamate.
As we have not seen either type of spermogonia in this species we have not been able to
identify this variety in our material. The description of the epithecium and the illustration
suggest L. Aubsrti Bonly de Lesdain (see below).
LECJDEA AUBERTI Rouly de Lesdain.
Lecidea ~ubdrti Bouly de Lesdain, Ann. Cryptog. Exot. 4: 99. 1931.
Type: ICerguelen, Port Jeanne d'Arc, AuberC de la Riie 18.
Thallus white, uniform, indeterminate, very thin and continuous near the margin, centre
areolate diffract and thicker, K yellow; cortex 65p thick of subspherical cells and many crystals;
algae protococcoid, cells up to 8p in diameter in rounded groups just under the cortex,
more scattered and ellipsoidal below; medullary hyphae slender, closely woven, mostly vertical.
Apothecia 0.5-0.6 mm. in diameter, scattered or sometimes crowded, then somewhat angular,
margin slightly crenate, disc plane, covered with an ochraceous pruina (somewhat lighter than
that of L. phaeostoma) when young, becoming black when old, occasionally with sterile papillae
or almost gyrose ; parathecium carbonaceous, marbled with lighter veins, 180p thick, not ex-
tending much below the hypothecium and only to the cortex of the thallus; lower portion of the
hypothecium about 20OP thick of closely woven subvertical medullary tissue with scattered algal