LICHENS AND LICHEN. PARASITES

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DODGE-LICHENS AND LICHEN PARABITES 193
hyphae, 2-+ in diameter ; lower cortex 40-60,~ thick, of very darlr, sometimes black, hyphae, more
or less periclinal, with here and there groups of cut ends of hyphae running at right angles to tk others ; rhizinae common up to 1,100.ct in diameter, of dark hyphae with an outer layer 10,~ thick,
identical and continuous with that of the thallus.
Apothecia up to 0.5 mm. in diameter, rrore or less circular, with a prominent margin.
reddish brown to grey, sessile, very rare ; amphithecium 50-80,~ thiclr, cortex about 20.~~ mostly
decomposed, occasionally somewhat fastigiate ; ~arathecium not developed ; hypothecium 10-20,~
thick, hyaline, of slender densely woven hyphae ; thecium 50-6OP tall; paraphyses about l,~ in
diameter, with slightly enlarged apical cells surrounded by a gelified sheath 3.5r, in diameter,
mostly straight, rarely branched; epithecium 5-10,~ thick, light brownish; asci 50-60 X 1C~15~,
clavate with thick wall, protoplast unibonate, 8 spored; ascospores broadly ellipsoidal to subreniform,
9-11 X 4.5-6p, hyaline. _- ,
Spermogonia 70 X 9OP, flaslr-shaped, with a darlr brown wall of thick-walled, isodiametric
cells ; spermatia 1-1. 5r, long, very slender, straight.
Our sterile, somewhat fragmentary material agrees well microscopically. The material from
King George V Land is very fragmentary with the whole upper surface eroded, leaving only the
lower part of the medulla and the large, short rhizinae.
Growing over mosses and other lichens.
King George V and': Cape Denison, A.A.E. 16.
Queen Mary Land : David Island, C. T. Harrisson. A.A.E. 8; Possession Nunatak, C. T.
Harrison, A.A.E. 61pl.
MacRobertson Land : Cape Bruce, B.A.N.Z.A.R.E. B108-36, B108-37, B108-38.
PARMELIA COREYI Dodge & Baker.
Parntelia Coreyi Dodge & Baker, Ann. Mo. Bot. Card., 25, 595 ; 1938.
Typej&iarie Byrd Land, Edsel Ford Range, Slrua Gull Peak, P. Siple & S. Carey 72W-3. ,
Thallus fragile, laciniae convex, 0.4-0.5 mm. broad, tips flabellate, 0.8-1.0 mm. broad,
sinuses excised, tips of lacinulae rounded, smooth, pruinose, rarely eroded, granulose, grey and '
darkening, K yellow; upper cortex 10-20,~ thick, fastigiate, of ellipsoidal cells 5-5-7 X 4-5,~,
loosely packed (but more closely than in P. variolosa), upper cells darkened, covered by a gelified
layer 7-lor, thick; algal layer 30-35r, thiclr, ce1's up to lor, in diameter, protococcoid; medulla
700-1,000,~ thick, of loosely woven hyphae somewhat brownish throughout; lower cortex 20-30p
dhick, less compact than in P. vario!osa, only the outer cells darkened, hyphae periclinal; rhizinae
[numerous, 700-1,000,~ in diameter, branched, dark brown, cortex up to 10,~ thick, of dark, short,
thick-walled cells, the rest of conglutinate longitudinal hyphae.
Apothecia up to 0.5 mm. in diameter, rarely with a prominent margin, brown, sessile; hypothecium
hyaline ; thecium 45-55r, tall ; paraphyses 1-1 .5,~ in diameter, rarely branched, septate,
the terminal cells enlarged, surrounded by a gelified sheath, up to 3.5,~ in diameter, brown at
maturity, epithecium 5-10,~ thick, brownish, gelified; asci 42-50 X 10.5-13p, broadly clavate,
protoplast with small umbo, wall inoderately thick, 8-spored; ascospores elongate-ellipsoid io
subreniform, hyaline, 10.5-14-5 X 3.5-4. 5r,.
Spermogonia about 55 X 7OP, subspherical, the walls not darkened, immersed; spermatiophores
thick, dosely septate.
Only a few sterile fragments seen, identification uncertain.
Queen Mary Land : Hippo Nunatak, C. T. Harrissdn, A.A.E. 9; David Island, C. T. Harrissoil,
A.A.E. 37.