LICHENS AND LICHEN. PARASITES

172 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
Spermogonia ellipsoidal, imbedded in the cortex, about 50p i11 diameter and 90p tall; wall
very dark brown, 18-20p thiclr; spermatiophores slender, 10-12p long; sperinatia 6-7 X 0.5p,
straight.
The above descriptioil is largely based on specimeils from King George V Land. When I
studied the types in Oslo and Upsala, the material was so scanty that 1 did not sectioil an
apothecium. The present material is somewhat smaller, perhaps because it was growii~g on
~vinclswept granite instead of a more protected habitat among mosses.
011 roclrs with Heppia antarctica, Lecidea cancrifo~.nLis, Bwidia Joh?wtoni, UntBiL-icaria
H?6?ttcri1 U. T?&~os~, Charcotia cerebriformis, Dern~atiscum Muwsoni, Lecanora Johnstoni,
Alcctoria conrjesta, Eolycaz~liona citrinaand Ri~odina frigida, and on old skin of sea elephant
(Nacrorhinzcs 'leoninzcs) .
King George V Land : Horn (Dreadnought) Bluff, A. L. McLean, A.A.E. 13 ; Cape Denison,
A.A.E. 23, 95-1, 99, 131, 142, 150, 151, 152, 153, 154,155, 156, 157, B.A.N.Z.A.R.E. 536-1, 536-6,
536-11, 536-16, 536-18, 536-29, 536-33, 53642.
MacRobertson Land: Cape Bruce, B.A.N.Z.A.R.E. 108-9, 108-10, 108-11, 108-12, 108-13,
108-14; 1847.
LECANORA EXSULANS forma MINOR Dodge, forma nova.
Type : King George V Land, Cape Denison, A.A.E.
Apothecia minora, non ad 1 mm. diametro adtingentia; thecium ca. 3 5 ~ altitudine ;
ascosporae minores, 6-7 X 4p.
Apothecia fewer and smaller, less than 1 mm. in diameter, thecium about 35p tall; ascospores
smaller, 6-7 X 4p.
Only more field observations and more abundant collections can furnish data as to whether
this smaller form is really distinct or only an ecological variant. The collections from
MacRobertson Land cited above are somewhat intermediate in size.
On rocks with Heppia. antarctical, Toninia Johnstoni, Umbilicariu mgosu, Lecanora Johnstoni,
Rinodina frigida and B. Johmtoni.
King George V Land : Cape Denison, A.A.E. 158, 159, 160, B.A.N.Z.A.R.E. 536-2, 536-8.
536-9, 536-10, 536-24, 536-30, 536-31, 536-32.
LEC ANORA JOHNSTONI Dodge, sp. nov.
Type : King George V Land, Cape Denison, B.A.N.Z.A.R.E. 536-34.
Thallus cerebriformis, ad 5 mm. diametro, 4 mm. altitudine, subrugosis, lobis marginalibus
applanatis, laevibus, minute crenulatis, pallidis, umbrinus; cortex 3540p crasstitudine subdecompositus,
pse~dd~arench~maticus, ex hyphis periclinalibus, 4-5p diametro, crystallis flavidis
inspersis; algae protococcoideae in strato denso sub hypothecio, aliter inter hyphis medullaribus
sparsis, cellulis 7-8p diametro ; medulla compacta, hyphis hyalinis, pachydermeis, ca. 4p diametro.
Apothecia 5-6 mm. diametro, disco plano vel subconvexo, isabellino vel brunneo-olivaceo, margine
tenui, pallidiori, mox evanescente, non elevato, sessilia, basi constricta; cortex amphithecii magis
decompositus, thallino similis; stratum algarum, ca. 55p crassitudine; parathecium ca. 35p
crassitudine sub hypothecio, hyphis plus minusve periclinalibus P5p diametro, hyalinis, dense
contextis ; hypothecium ca. 2OP crassitudine, hyphis subverticalibus, tenuibus, septatis ; thecium
50-55p altitudine ; paraphyses tenues, ter dichotomae super ascos, ramosae, ramis moniliformibus,
spice ellipsoideo, ca. &6p, pachydermeo; asci clavati, 22-25 X 7-8p, stipite 25p longitudine,
apicibus incrassatis, protoplasto mamillato dein maturitate magis ellipsoidei, ca. 25 X 12p;
ascosporae uniloculares, hyaline, episporio crasso, 8-10 X 4-5p.