LICHENS AND LICHEN. PARASITES

116 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
plum, Rhizocarpon kerguelense, Aspicilia d;isjunguenda, A. endochlora, Lecnnora atrocaesia and
Bt~ellia sz~bplicata.
Kerguelen : Greenland Harbour, B.A.N.Z.A.R.E. B177-43 ; Royal Sound, B.A.N.Z.A.R.E.
B90-7, B90-8 ; Molloy Point, J. H. Kidder (U.S. Transit of Venus Exp. in Tuclrerman Herb., on
rock with " Blrellin geographicnu sheet 3273).
RIII~CARPON URCEUL~NUM Dodge, sp. nov.
Lecidea geogrnphica v. ~irceolata Hook. f. & Tayl., Crypt. Antarct., 233; 1845; F1. Antarct., 2,
539 ; 1847 non Schaer.
Type : Kerguelen, Observatory Bay, B.A.N.Z.A.R.E. B192-34.
Thallus obscure grisens, tenuissimus, rimuloso-areolatns marginc angnsta, nigra, non lobatus;
algae protococcoideae, cellulis 4-5,~ diametro ; medulla I-. Apothecia minuta, urceolata, in areolis
immersa, marginibus obscurius griseis, ostiolis circiter 0.1 mm. diametro, disco concavo, nigro;
parathecium circiter 30,~ ad ostiolnm crassitudine, involncrellum carbonaceum 200,~ latitudine,
75,~ crassitudine formans, dein subhypothecio 20-25r crassitudine, brunneum, hyphis magnis
septatis laxe contexturn, psendoparenchymaticum ; hypothecium non bene evolutum ; thecium
125-130~ altitndine ; paraphyses tenues, flexuosae, dichotome ramosae, rami submoniliformes ;
asci cylindrici, juventute 75 X 1 5 dein ~ 110 X 32r; ascosporae 30 X 15,~ juvcntute, late ellipsoideae,
muriformes, dein 35 X Isr, vagina tenui evanescenti.
Thallus dark grey, very thin, rimulose areolate with a narrow dark margin, not lobed; algae
protococcoid, cells 4-5u in diameter ; medulla I-. Apothecia minute, nrceolate. immersed in the
areole, margin darker grey, opening over the disc about, 0.1 mm. in diameter, disc very concave,
black; parathecinm about 30,~ thick at the ostiole, spreading outward and downward, similar to
the involucrellnm of Verrz~caria for aboud 200,~, ending abruptly, where it is 7 5 thick, ~ inner
portion thin, 20-25,~ thiclr, cnrving downward around the hypothecium, carbonaceous above,
becoming bro~\-11 below, of large, septate, loosely woven hyphae, almost pseudoparenchymatous,
nearly hyaline between the two layers below, with algal cells penetrating as far as the base of the
thecium ; hypothecium not well differentiated ; thecium 125-130,~ tall ; paraphyses slender,
flesnons, spariilgly dichotomously branched above the asci, branches somewhat moniliform, ending
in the epithecial gel ; asci cylindric, 75 X 15,~ before the spores begin to differentiate, then elongating
to 110 X 32,~; ascospores 30 X 15,~ when young with a rat he^ thin sheath, broadly ellipsoidal
and early forming both transverse and longitudinal septa to form a many-elled muriform,
brown spore, 35 X 15p without a sheath.
Lecidea geographica v. z~rceolata Hook. f. & Tayl. probably belongs here rather than in
R. kerguelense as I have seen no specimens with concave discs in, the latter.
On rocks with Rhizocarpon candidz~m, Pertztsaria cineraria, P. subperrintosa, Placopsis
bicolor and Bzrellia tristizcscula.
Kerguelen : Observatory Bay, B.A.N.Z. A.R.E. B192-34, B192-40 ; Grave Island,
B.A.N.Z.A.R.E. B91 (old and determination uncertain).
RHIZOCARPON KERQUELENSE Dodge, sp. nov.
Lecidea geographica Hook. f. & Tayl., Crypt. Antarct., 233 ; 1845 : F1. Antarct., 2, 539 ; 1847 :
Crombie, Jonr. Linn. Soc. Rot., 15, 191 ; 1877 : Jour. Bot. Brit. For., 15, 105 ; 1877 : Phil.
Trans. Roy. Soc. [London], 168, 52; 1879: Rept. Sci. Results Voy. "Challenger" Bot., 1,
2, 240; 1885 non (Dill, ex L.) Rebent.