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114 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION<br />
In both apothecia sectioned, the asci are mostly quite immature. Two asci were seen with<br />
still immature binucleate spores (furnishing the ascus measurements above) and a slightly older<br />
but smaller ascns with one spore at least 3-, possibly 4-celled. In the latter ascns, the ascospores<br />
were nearly straight and furnished the above measurements, which may still be too sniall for the<br />
mature spores. Much of the matcrial from other localities is too immature, or too old and<br />
weathered for certain identification, but has been referred here on thalline and such apothecial<br />
characters as are observable.<br />
On crystalline quartz beset with small amethystine or pinkish crystals, growing with hecanora<br />
ezsulans f. minor, Thamnolecomia Ma~usoni, Polycauliona citrk, Buellia frigida and B. podocarpa.<br />
King George V Lalid : Madigan Nunatak, 2,400 ft., C. F. Laseron, A.A.E. 25-2; Cape Deniso11<br />
A.A.E. 93, 96, 97, 102-1, 103-2, 123, 132, 133, 134, 135, 136, 137, 138, 139; B.A.N.Z.A.R.E.<br />
536-7, 536-8, 536-9, 536-10, 536-11.<br />
Queen Mary Land: Possession Nunatak, C. T. Harrisson, A.A.E. 76.<br />
MacRobertson Lancl : Cape Bruce, B.A.N.Z.A.R.E. 108-7, type, 108-8.<br />
I<br />
RHIZ~CARP~N Ram.<br />
Rh.izocarpon Ram. in Lamarck & D.C., F1. Franc. ed., 3, 2, 365; 1805.<br />
Abacina. Norm., Nyt Mag. Naturvidensk., 7,236 ; 1853.<br />
Siegertia Koerb., Parerga Lich., 180 ; 1861.<br />
Phaloclkty~mt Clements, Gen. Fung., 77; 1909.<br />
Type: Rhizocarpon yeographicum (Dill. ex L.) Ram. The type of Aba,cinu was not desig-<br />
nated, but A. antphibia (Fr.) Norm. may be so considered. The type of Siegertia is Leciriea<br />
calcareu (Weis) EIepp. The type of Phalodictyum is P. obscuratum (Ach.) Clements.<br />
Thallus crustose, uniform, with well developed hypothallus; ecorticate; algae protococcoid.<br />
Apothecia sessile or immersed in the thallus; parathecium carbonaceous, rarely brown; hypo-<br />
thecium dark; thecium gelified, paraphyses branched ; asci 1-8-spored ; ascospores hyalille or finally<br />
brown, 2-several-celled becoming muriform by vertical septa, with a well developed, gelified sheath.<br />
Spermatia cylindric to acicular, straight or nearly so.<br />
Thallus white, cracking radially, centre soraliate; ascospores 47-51 X 17-18r R. candidzim<br />
Thallus dark grey, dark olive to black, esorediate, areolate; ascospores smaller<br />
Thallus dark olive buff to black, ascospores long 4-celled finally becoming few-celled muri-<br />
form, sheath thick but finally disappearing, 25-28 X 10-11p . . R. Mawsoni<br />
Thallus dark grey, ascospores early many-celled muriform, sheath thin and ;ady disappear-<br />
ing, 35 X 15p . . . . . . . . . . . . R. urceolina<br />
Thallus some shade of yellow or green variegated with blaclr, sometimes light mineral grey in<br />
weathered specimens, not sorediate, areolate<br />
Ascospores 30 X 18p, early muriform; thallus usually bright chalcedony yellow<br />
R. ktvguelense<br />
Ascospores 21-25 X 10-llr, long 4-celled, finally few-celled muriform ; thallus pale chalcedony<br />
yellow to tea green and mineral grey . . . . . . . . R. Johnstoni<br />
RHIZOCARPON C<strong>AND</strong>IDUM Dodge, sp. nov.<br />
Type : Kerguelen, Observatory Bay, B.A.N.Z.A.R.E. B192-35.<br />
Thallus crassus, albus, rimoso-areolatus, margine zonata, radianter fissus, lobis cuneatis, hypo-<br />
thallo tenuissimo, nigro; areolis centricis soraliatis, soredia coloniis protococcoideis circiter 20p<br />
diametro hyphis subgelifactis circumdatis. Apothecia innata, 0-1-0.2 mm. diametro, disco iligro;
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