LICHENS AND LICHEN. PARASITES

266 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
the brownish epithecial gel; asci 45-55 X 15-18p, oblong clavate, tips slightly thickened; ascospores
distichous, polari-bilocular when young, ovoid to broadly ellipsoid, becoming dark brown,
14-18 X 7-9p, clearly septate and constricted at the septum.
[Spermogonia marginal, semi-emersed, punctiform, black; wall darkened above; spermatio-
.
phores septate, little branched; spermatia ovoid or ovoid-oblong, 3 X lp-Zahlbrucknerj.
As the thallus becomes moribund, the medullary hyphae under and around the thecium become
stained brownish to black, the spores remaining in the ascus shrivel until it might be taken for
another species, but transitional stages present in our material, indicate that they are moribund.
On rocks with Verrucaria hehem, Thelidiun~ praevalescens, Microglaena kerguelana, Lecidea
sublljgmma, Rhizaocarpon keryuelense, Pertusaria crozetica, Aspicilia disjunguenda, Lecanora atrocaesia,
Pyrenodtxmia kerguelensis, Kuttlingeria crozetica and Buellia subplicata.
Grozet Archipelago : Possession Island, American Bay, B.A.N.Z.A.R.E. B20-7.
Kerguelen : Greenland Harbour, B.A.N.Z.A.R.E B177-5, Bl77-62 ; Royal Sound,
B.A.N.Z.A.R.E. B90-10, B126-2, B126-23, B126-27.
Heard Island: between Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. R140-6.
Rinodina peloleuca Miill.-Arg., Nuov. Oiorn. Bot. Ital., B, 125; 1891. -
IIecawa pelolezcca Nyl., Jour. Linn. Soc. Bot., 9, 251; 1865.
Type: New Zealand, Dunedin, on basalt, Lnuder Lindsay.
Thallus white, subdeterminate, thin, areolate rimose; cortex about 35p thick, of fastigiate
hyphae with more or less isodiametric cells, decomposing above ; algal layer 35-50p thick, protococcoid,
cells spherical, 12-15p in diameter ; medulla of vertical, thick-walled hyphae, enclosing
many rock crystals below.
Apothecia 0.4-0-5 rnm. in diameter, constricted below, disc black, margin white; amphithecia1
cortex 60p thick below, thinning to 35p at the margin, fastigiate, similar to that of the thallus ;
algal layer well developed, 40p thick, of closely packed cells to much thinner or finally absent; para.
thecium 15-20p thick, hyaline; of very slender periclinal hyphae; hypothecium about 100p thick,
of kfertical hyphae, not clearly djffcrentiated from the thecium above ; thecium 150;~ tall : paraphyses
conglutinate, aboct lp in Ziameter, branching above the asci, tips clavate, 5p in diameter,
brown; asci about 75 X 30p, tip thickened, with broadly mamillate protoplaat when young,
8-spored; ascospores brown, 2-celled; polaribilocular as they begin to brown, finally slightly constricted
in the middle with moderately thickened walls, 2+27 X 9-llp.
The development of the spores suggests a relationship with R. aspicilz'na.
On rock with Lpcania Johnstoni, Pyredesmia inc!kns and Gnspnrrinia nzacquariensis.
Macquarie Island : Featherbed Flat, B.A.N.Z.A.R.E. 5333, 533-6.
RINODINA SUBBADIOATRA (Knight) Dodge, comb. nov.
Lecidea subbadioatra Knight, Trans. P1.o~. N. Zealand Inst., 8,317 ; 1875 [I8761 ; Trans. Linn. Soc.
Bot. II., 1, 276; 1877.
Buellia subbadioatra Miill.-Arg., Bull. Herb. Boissier 2 : append., 1, 70; 1894.
Type: New Zealand, Charles Knight, on rocks.
Thallus about 400u thick, smooth, gelatinous when moist, becoming chalky white and slightly
Rmulose areolate when dry ; cortex a palisade of pseudoparenchyma, 20--35p thick, decomposing ;