LICHENS AND LICHEN. PARASITES

178 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
thecium about 150~ tall when spores begin to mature, becoming 220~ tall when fully mature;
paraphyses slender, repeatedly dichotomously branched, especially above the asci where the
branches become more c!ocely septate and finally moniliform ; asci cylindric, 8-spored, thin-walled,
tips not thickened, 150 X 10-22p ; ascospores monostichous, unicellular, hyaline, short ellipsoidal,
thin-walled, 18-20 X 10-12p.
Spernlogoilia ovoid, 400p tall, 250p in diameter ; wall 3OP thick, hyaline, of periclinal hyphae
similar to those of the mednlla but more compact, invaginating to increase the fertile surface;
spermatiophores 35p long; spermatia exobasidial, short bacilliform, 5-6 X lp.
A greyish brown thallns with a few traces of pale orange remaining, on rock with Steinera
glaucella from Kergnelen, Molloy Point, J. H. Kidder (1T.S. Trailsit Venus Exp.) in Tuclrerman,
Herb, sheet 1,452, determined as Lecnnora gelirla (L.) Ach., is very weathered and "insect" eaten
and is thought to belong here but was not sectioned.
Usually solitary, but also on roclrs with JTerrucaria obfzlscata, V. Mawsoni, Thrombiun~
kerguelanzma, Ionaspis illazusoni, Steinera glaz~cella, Lecidea phaeostoma, L. rhizocarpiza, L. .cubcontinua,
Mykoblastus stepltanorles, Rhizocrrrpon urceolinunt, Pertusaria cinernlia and Buel!ia
tristizcscula.
Crozet Archipelago : Possession Island, American Bay, B.A.N.Z.A.R.E. B20-13, B20-14.
Kergnelen: Molloy Point, J. H. Ki'rlder (U.S. Transit Venus Exp.) in Tuckerrnan Herb.
sheet 1,777a, type; Christmas Harbour, J. D. IIooker (Voy. "Erebus & Terror" in Taylor Herb.
snb Lecanora gelida (L.) Ach. ainlotated Placodium bicolor Tuck., sterile with spermogonia j ;
Greenlailcl Harbour, B.A.N.Z.A.R..E. B177-60, B177-61; near Port Jeanne d'Arc, 1,400 ft.,
B.A.N.Z.A.R.E. B200-1, B200-6, E200-7, B200-9 ; Royal Sound, B.A.N.Z.A.R.E. B126-19,
B126-20, B126-21; Mt. Wyville Thompson. B.AN.Z.A.R.E. B246-15, B246-16, B248 ; Observatory
Bay, B.A.N.Z.A.R.E. B192-3, B192-25, B19240, R192-51, B192-52, B192-53.
Heard Island : between Atlas Cove aild Corinthian Bay, B.A.N.Z.A.R.E. B140-3, B140-20,
B140-33. B140-34.
PLAIXPSIS vrTELLrN.4 (Bab.) Dodge, comb. nov.
Lecanora (Plwopsis) gelidrr v. vitellina Bab. in Hook f. Cryptog. Antarct., 229; 1845: F1.
Antarct., 2,535 ; 1847 : Bouly de Lesdain, Ann, Cryptog. Exot., 4, 101 ; 1934.
Type : Herguelen, Christmas Harbour, J. D. Hooker (Voy. "Erebus & Terror"), not seen.
Thallus thinner, rimoee, areolate, areoles not convex but variously wrinkled and verrucose,
margin thin, lobed, lighter in co!onr and free from the substrate, ochraceous'buff to light
ochraceons buff, cortex 35p thick, almost pseudoparenchymatous from a palisade of septate hyphae,
4p in diameter, decomposing above but not conspicuously gelified ; algal layer 300p thick, probably
originally protococcoid hnt largely replaced by broken filaments of Stigonema, about 34p in
diameter in long narrow vertical colonies, separated by strands of vertical medullary hyphae;
medulla thin, of conglutinate, deiisely woven hyphae; external cephalodia similar to those of
P. bkolor but thinner and flatter, less regularly cracked, concolorous with the thallus becoming
blackened in age. Apothecia sessile, disc flesh colour, becoming carnelian red or darker at
maturity, slightly concave with prominent warm buff margins, solitary or crowded in groups of
34 with connate margins, but discs not angular ; amphithecium 250p thiclr ; cortex 25p thick of
gelified pseudoparenchyma, the outer third hyaline, the rest packed with coloured crystals, giving
a deep brown colom, nearly opaque; algae and medullary hyphae filling the rest; parathecium
35-50p thick, apparently of conglutinate, periclinal hyphae bnt darlr brown, almost opaque,
extending under the hypothecium ; hypothecium obconical, 325p tall, of vertical hyphae, becoming