LICHENS AND LICHEN. PARASITES

sn J~,A.N.z. ANTARCTIC RESEARCH EXPEDITIOX
IJECIDEA VARIATULA Nyl.
Lecidea ,variatvla Nyl. ap. Crombie, Jour. Linn. Soc. Bot. 15, 186; 1876. Phil. Trans. Roy. Soc.
rlondon], 168, 50; 1879. Rept. Sci. Resiilts Voy. "Challenger" Bot., 1, 2, 236; 1885.
Type: Kerguelen, Observatory Ray, A. E. Eaton (Venus Transit Exp.).
Thallas whitish, finely subgranular, dispersed. -\poihecia 0.3-0.5 mm., pale at first becoming
fuscous and finally blackening, disc plane or somewhat concave, margined; parathecinm white,
hypothecium hyaline; paraphyses slender, discrete, tips not thickened; asci 8-spored; ascospores
hyaline ellipsoid, unicellular 11-15 X 6-7r. Asci alone becoming blue with iodine and then violet
fnscous, thecial gel not coloured.
On decaying steins of Acuena. No material of this species has been seen. Nylander referred
it to the group of Lecidea wtutabilis.
LECIDEA MAWSONI Dodge, sp. nov.
Type: Kerguelen, Observatory Bay, R.A.N.Z.A.R.E. B192-12.
Tballus minute ~er~uc~~loso-granulosus, dilute griseus; ecorticatus; algae protococcoideae,
cellulis 5-6r diametro, snbverticaliter dispositis. Apothecia sesilia, nigra, circiter 0.25 mm.
diametro, di-sco nigro concaviusculo vel plano; parathecium 35r crassitudine, hyphis tenuibus
periclinalibus, intus dilute brunneis, extus obscure brunneis, non sub hypothecio percurrens;
hypothecium 75r crassitudine hyphis tenuibus dense contextum in strato gonidiali impositum ;
thecium 150-180~ altitudine; paraphyses tenues dichotome ramosae anastomosantesque, apicibus
non incrassatis, liberis ; asci cylindrici dein clavati, 60-65 X 20-22r apicibus non incrassatis ;
ascospores 8nae late ellipsoideae maturae subbrunneae 14-15 X 10-11r.
Thallus minutely verrucose granular, indeterminate, but separated by a black line when in
contact with the margin of Lecanactis Matusmi, light mineral grey; ecorticate; algae protococcoid,
cells 5-6r in diameter, arranged in more or less vertical rows. Apothecia sessile, black,
about 0.25 mm. in diameter, disc black, concave to plane; parathecium 35r thick of slender,
periclinal hyphae, slightly brownish within, darker brown next the surface, not extending below
the thecium ; hypothecium 75r thick, of densely woven, slender hyphae, seated on the algal layer;
thecium 150-180r tall ; paraphyses slender, dichotomously branched and anastomosing, tips not
enlarged, free, epithecial gel more or less covered with spores and foreign Myxophyceae; asci
cylindric at first, becoming clavate, 60-65 X 20-22r, waJl 2r thick, tip not thickened, 8-spored;
ascospores monostichous at first becoming distichous in the upper portion only, thin-walled, unicellular,
slightly brownish when mature, broadly ellipsoidal, 14-15 X 10-llr.
This species seems distinct from L. vam'atula Nyl. of which we have seen no material. It
may also be related to Plaeopsis, since the paraphyses, young asci and ascospores are much closer
to P. vitellina than to most species of Lecuka, but it lacks the well developed amphithecium and
external cephalodia.
Growing with Lecanactis Mawsoni. ,
Kerguelen : Observatory Bay, B.A.N.Z.A.R.E. B192-12.
LECIDEA SUBDISJUNQUENDA Zahlbr.
Leck!ea subdisjunguenda Zahlbr., Deutsche Sudpolar Exp., 8, 39 ; 1906.)
Type : Kerguelen, Station lake, Werth (Dentsche Sudpolar Exp.) .
Thallus very thin, continuous or minutely rimulose, whitish, sometimes coloured ferruginous,
K yellowing then slowly reddening, Ca-, more or less cut by black lines of protothallus; ecorticate;
algae protococcoid, spherical, 9-12~; medulla of vertical hyphae. Apothecia innate to
slightly elevated, up to 0.5 mm. in diameter, disc plane to slight.1~ convex, margin slightly