LICHENS AND LICHEN. PARASITES

802 B.A.N.Z. ANTARCTIC REJSEARCH EXPEDITION
horny, yellow without, of fastigiate pseudoparenchyma, cells thin-walled, up to 7p in diameter;
algae protococcoid, cells up to 8p in diameter, scattered in the medulla which is thin, 80-loop,
dense, white, K-, of smooth hyphae 1.53- 5p in diameter, branched and anastomosed, irregularly
woven in a close network, denser next the cortex, looser next the axis; chondroid axis about 450p
thick, horny, slightly fuscous, of conglutinate, longitudinal hyphae lp in diameter, cells 25-30p
long. Sterile. Soredia frequent in the upper portions, granulose farinose, white or finally
blackened, soralia deeply eroded, or at least not in tubercles.
The material here reported is smaller, only 1.5 cm. tall and less branched; soredia less ab~ui-
danl ; cortex 40-50p thick ; medulla 75-130p thick, similar in structure but somewhat more loosely
woven ; axis *out 180p in diameter, growing on granite.
S.outh Victoria Land: Cape Irizar [75" 30' S., ca. 163" E.], D. Mawson, 1,057, British
Antarctic Exp., 1907-9.
King George V Land: Penguin Point [ca. 67" 35' S., 146" E.], A. L. McLean, A.A.E. 86, 87.
USNEA SUB*-OVEOLATA Dodge, sp. nov.
Type : Queen Mary Land, C. T. Harrisson, Hippo Nunatak.
Thallus ad 3 cm. altitudine, repetito-dichotome ramosus, internodis brevibus, rami basi lion
constricti, rigidi, nitidi, superne nigri vel nigroannulati sed non fracti, inferne ochraceolutei vel
ochraceo-aurantiaci, ad 0.7 mm. diametro; ramis ultimis longis, tenuibus, teretibus, rugosis et
profunde foveolatis; soredia tuberculata, in ramulis ultimis, granulosa, deinde partim erosa, in
soraliis orbicularibus subconvexis, apothecia minuta simulantibus, juventute nigris deinde flavidis
aut sordide griseis; cortex 70,~ cracsitudine strato extero 5p crassitudine gelifacto, strato infero
10-1% crassitudine hyphis periclinalibne, reliqua parte hyphis verticalibus, 5.p diametro, septatis,
cellulis isodiametricis cum crystallis minutis, flavidis nubilatie ; algae prot.ococcoideae, ad 10u diametro,
infra cortice in medulam sparsae; medulla K-, ca. 190F crassitudine, hyphis pachydermaticis
laxe intertextis, ca. 4,~ 4diametro cum crystallis hyalinis nubilatis, hyphis intimis ex axi chondroideo
radiantibus ; axis chondroidens rec'tione transversali ellipticus vel subquadratus, ca. 400;~
diametro hyphis conglutinatis longitndinalibus. Apothecia spermongoniaque non visa.
Thallusup to 3 cm tall, repeatedly dichotomous just above the base with very short inter
nodes, branches not constricted at the base, rigid, shining, black 01. black annulate above, not
cracked, yellow ochre to ochraceous orange below, up to 0.7 mm. in diameter below; ultiniato
branches l'ong, slender, terete, rugose and deeply foveolate; soredia tuberculate on the ultirnnte
branches, granular, finally partly eroded, leaving slightly convex, circular soralia resembling
minute apothecia, black when young, becoming yellowish and finally dirty grey; cortex 70p thick,
highly gelified, the outer 5p clear, lower 10-12,~ of periclinal hyphae whose branches form the
palisade, the rest a palisade of hyphae 5, in diameter, cells nearly isodiametric, walls with very
minute yellowish crystals; algae protocozcoid, up to 10,~ in diameter, mostly smaller, scattered
in the medulla below the cortex; medulla K- about 190:~ thick, of loosely woven thick-walled
hyphae about 4!~ in diameter, nubilated with hyaline crystals, the inner hyphae radiating from
the axis, leaving large air spaces; chondroid axis short elliptic to somewhat squarish, about 400p
in diameter, of densely packed conglutinate, thick-walled, longitudinal hyphae. Apothecia and
spermogonia not seen.
Macroscopically this species suggests U. frigida, although the foveolation is more oonspicuous
and the thallus is rather less blackened, but the microscopic structure resembles that of U. antartica,
from which it differs in the conspicuous foveolation and the soredia.
Queen Mary Land: Hippo Nunatak, C. T. Harrisson, A.A.E. 82-2 type, 71-3.