LICHENS AND LICHEN. PARASITES

250 B.A.N.Z. ANTARCTIC RESEARClI EXPEDITION
quently, so the resulting cells are smaller. The host algal cells are mostly 7-SF in diameter and
clearly protococcoid.
King George V Land, Cape Dension, H.A.N.Z.A.R.E. 536-31 on Lecanora exsulans;
1 B.A.N.Z.A.R.E. 536-34 on L. Joknstoni.
BUELLIA PINNICOLA Dodge, sp. nov.
l'ype : King George V Land, Cape Denison, near hut, B.A.N.Z.A.R.E. 536-59, on decaying
feathers.
Thallus albus, planus vel irregulariter minuteque tubercularis, indeterminatus, margine
tenui ; cortex ca. 3OP crassitudine, hpphis septatis laxe contextus ; algae cystococcoideae, in strato
7OP crassitndine, cellulis 10-15p diametro; medulla laxe contexta. Apothecia ca. 0.4 mm.
diametro, hemisphaerica, brunnea vel nigra, semi-immersa, disco brunneo vel nigro, convexo,
margine tenuissimo, concolore ; parathecium 35r. crassitudine, dimidia parte extera fastigiata,
cellnlis elongatis, turgidis, intns hyphis, tenuibus, periclinalibus, conglutinatis hyalinis ; hypothecium
hemisphaericum, ad 12OP altitudine, obscure brunneum ; thecium ca. 75~ altitudine ;
paraphyses tenues, dichotome ramosae super ascos, ceHulis terminalibus late clavatis, obscure
brnnneis, pachydermeis, 5-6r. diametro ; asci clavati, 35 X 12r., apicibus incrassatis; ascosporat.
octonae, oblique monostichae vel subdistichae, brunneae, biloculares, rectae vel curvatae, 15 X 'ip.
Non-assimilative thallus not evident, assimilative thallus white or slightly buff, flat or
irregularly and minutely tubercular, indeterminate, margin thin ; cortex thin, about 30~ thick,
of slender, loosely woven septate hyphae about 3r. in diameter (perhaps the true cortex has been
eroded, leaving only the medullary hyphae surrounding the algal colonies) ; algae cystococcoid,
in colonies of variable size, scattered or forming compact layers up to 7OP thick, cells up to 10-15r
in diameter ; medulla loosely woven below, becoming vertical and compact in the centre of the fertile
pillars, curving outward around the hypothecium and merging with the parathecium ; basal layer
not differentiated.
Apothecia about 0.4 mm. in diameter: hemispheric, brown to black, semi-immersed on tops
of fertile pillars (tall verrucae), disc brown to black, convex, margin very thin and concolourous ;
parathecium 35~ thick, the outer half a palisade of swollen, elongate, dark brown cells, the inrier
half of slender, periclinal, conglutinate, hyaline hyphae, continuous with those of the medulla;
hypothecium hemispheric, about 120~ tall, deep brown, somewhat pseudoparenchymatous below,
cells longer and radially arranged above, passing into the thecium; thecium about 75r. tall ; paraphyses
slender, dichotomously branched several times just above the asci, terminal cells broadly
clavate, dark brown, thick-walled, 5-6~ in diameter; asci clavate, 35 X 12r., tips somewhat
thickened when young, 8-spored ; ascospores obliquely monostichous to somewhat distichous, brown,
2-celled, straight or curved, 15 X 7r..
An A.A.E. collection also on decaying feathers from the same locality probably belongs here.
It is sterile, old and blackened, with colonies of various Myxophyceae.
King George V Land : Cape Denison, near hut, B.A.N.Z.A.R.E. 536-59 ; A.A.E. 43.
BUELLIA GRISEA Dodge & Baker.
Buellia yrisea Dodge & Raker, Ann. Mo. Bot. Gard., 25, 639 ; 1938.
Type: Marie Byrd Land, Edsel Ford Range. Haines Mts., P. Siple & F. A. Wade, H-1.
Non-assimilative thallus up to 1.5 cm. in diameter, radiate saxicolous, lobed, grey to white,
margins black; cortex fastigiate, of dark cells thinning out over the tops of the lobes; medulla