LICHENS AND LICHEN. PARASITES

176 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
Crozet Archipelago: Possession Island, American Bay, B.A.N.Z.A.R.E. B20-1, B20-10,
B20-11, B31, B32.
Kergueleil : Royal Sound, B.A.N.Z.A.R.E. I3126-10, B126-15, B126-16, B126-17, B126-18 ;
Greenland Harbour, B.A.N.Z.A.R.E. B177-3, B177-15, B177-30, B17740, B17741, B177-55,
B177-56, B177-57, B177-58, B177-59, BZ04-6; Mt. Wyville Thompson, 1,000-1,500 ft..
B.A.N.Z.A.R.E B246-1, B246-3, B246-12, B246-13, B246-14 ; Observatory Bay, B.A.N.Z.A.R.E.
B192-7, B192-16, B192-28, B192-33, B19241, B19242, B19243, B19244, B19245, B19246,
B19247, B19248, B192-49, B192-50
Heard Island : between Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. B140-16, Bl40-29,
B140-30, B140-31, B140-32.
ASPICILIOPSIS ANTARCTICA (Mull.-Arg.) Dodge, comb. nov.
Placodi?~m antarct.icunz Miill.-Arg., Bot. Jahrb. [Englerl, 5, 136 ; 1884 : Forschungsreise S.M.S.
"Gazelle," 4, 10; 1889.
Lecanora antarctica Zahlbr. Deutsche Siidpolar Exp., 8, 51 ; 1906 non Mull.-Arg. 1887.
Leca9tora (Asliciliopsis) s~cblateritiu Zahlbr., Cat. Lich. Univ., 5, 670; 1928.
Type: Icerguelen, Betsy Cove, circ. 500 ft., Nanmann, 191,241 ("Gazelle" Exp.).
Thallus placodioid, closely adnate, from the first monophyllous, radiately lobed, lobes con-
tinguous, and flattened, ultimate lobules broad and obtuse, not black marginate, lateritious to
orange, from smooth becoming minutely wrinkled. Apothecia minute, first showing as a pore, then
growing into a hemiSpheric protuberance with a wrinkled tip, then thelotremoid, rarely the disc
more open np to 0.5 mm., rufofuscescent, epithecinm orange rnfous, thecium hyaline; paraphyses
slender ; asci linear, 8-spored ; ascospores uniseriate, unicellular, hyaline, ellipsoid, about 20 X 13p
The colour of the thallus is probably spurious, due to iron. It differs from P. macroph-
thdmum in being thinner, lacking the blackened margin and in the thalline protuberances.-
Miiller-Argau.
Since we have been unable to see the type of this species, we are uncertain of its identity.
A specimen from Heard Island agrees with Miiller-Argau's description in all particulars, but from
a study of a large series of apothecia of Placopsis bicdor in all stages of development, our specimen
is clearly that species. It seems probable that Miiller-Argau, who had only a small amount of
material, mistook this juvenile condition which has begun to produce spores but in which the
thecium has not reached its maximum development and pushed back the greatly e,xpanded amphi-
thecium which nearly covers the younger thecium, for a distinct species froG the completely
developed state in which the amphithecium is scarcely elevated above the theciuh and the disc is
several times as large. I made this mistake until I had found so many of the intermediate stages.
Placopsis Nyl., Ann. Sci. Nat. Bot. IV, 15, 376; 1861.
Placodium s~tbg. Placopsis Mull.-Arg., Bot. Jahrb. [Engler] , 5, 135 ; 1884.
Lecamora subg. Placopsis Nyl. ir- Hue, Nouv. Arch. Mns. [Paris] III,3, 58 ; 1891.
The type species is P. gel& (L.) Nyl.
Thallus crustose, effigurate, cortex of thick-walled pseudoparenchyma; heteromerons ; algae
protococcoid with abundant internal cephalodia of Stigonema which often almost wholly replace
the normal symbiont ; external cephalodia apotheciiform, cracked (similar to those of Aspiciliopsis) .