LICHENS AND LICHEN. PARASITES

DODGE--LICHENS AND LICHEN PARASITE6 03
line, below the thecium becoming about 1 10p thick, carl~onaccons ; hypothccium scarcely differentiated
of vertical, somewhat more deeply staining hyphae; thecinm 17.5-180p tall; ~a~.nnhyses
slender, flexnous, dichotomously branched, especially above the asci, more closely septate, tips not
thickened, ending in the thin brownish epitliecial gel ; asci loug cylii~dric at first, the npper portion
becoming clavate, 8-spored, 35 X 15-lap, tip thickened, protoplast rolmded; ascospores subdistichous,
ellipsoidal, hyaline, appearing 2-celled at maturity, 11-14 X 5-6p.
The identity and systematic position of this species are somewhat. m~certain as there are some
differences from Zahlbrnckner's measnrements. The thallus cracks aronnd the apothecia, and if
this is taken as an amphithecium, it might be ref erred to Aspicilia.. As in so many species of
Lecidea from this region, the septation of the spores is doubtful. Whilc still in the ascus, the1.e
is a band of deeply staining protoplasm crossing the centre of the spore. In a fen- free spores, a
definite septum was seen in the middle of this deeply staining area. The mature spores inay be
two-celled or it may be that the septum is that which is often laid down on the beginning of germination
of a unicellular spore. This is the only material so far observed, referable to this species.
Growing with Microglaem kerguelann, Rhizocarpon h-ergzrelensa, Aspicilin disj?rnyluemIu,
Lecanora atrocaesia and Rinodina aspicilina.
Heard ,Island. Between Atlas Cove and Corinthian Bay. B.A.N.Z.A.R.E. B140-6.
LECIDEA SUBCONTINUA Nyl.
LecicEea subcontinua Nyl. ap. Crombie, Jour. Linn. Soc. Bot., 15, 189 ; 1877 : Jour. Bot. Brit. For.,
15,104,106 ; 1877 : Phil. Trans. Roy. Soc. [London], 168, 51 ; 1879 : Rept. Sci. Rewllts Voy.
"Challenger" Bot., 1, 2, 238 ; 1885.
Type: Kerguelen, Swain's Bay, Royal Sound, A. E. Eaton (Venus Transit Exp.).
Thallus deep glaucous grey, areolate diffract, growing over a black hypothallus which shows
as a relatively broad, thin, black margin, K yellowish, then reddening and finally becoming deep
brown; algae protococcoid, cells 5-6p in diameter. Apothecia innate, black, nrceolate at first
then plain, margin elevated, up to 1 mm. in diameter; parathecium carbonaceous, 60p thick at the
margin, thinning to 45p jnst below the edges of the hypothecium, then thickening to 90-100p
in the centre; hypothecium about 20p thick, of deeply staining vertical hyphae, not clearly distinct
from the thecium; thecium 75,~ tall; paraphyses slender, septate, unbranched, tips not
thickened, ending in the yellowish fuscous epithecial gel; asci clavate, 8-spored, 55 X 12p; ascospores
ellipsoid to subfusiform, hyaline, 11-14 X 6-8p.
Thq determination of my material is somewhat uncertain, as I have been unable to satisfy
myself as to the septation of the spores. As in several other species, there is a> deeply staining
mass of protoplasm in the centre which looks very like a septum. My material agrees in other
respects with ~~1aGder's description, except I have seen no spermatia, which he states to he
straight or slightly curved, 15-20 X 0-5-0.6p. He does not give reaction with ICOH. Our
material is quite close to Lecidea sablygontnta, which, hon-ever, does not turn red with ICOH.
Growing with Pertusaria cineraria and Placopsis bicolm.
Kerguelen : Observatory Bay, B.A.N.Z.A.R .E. B192-25.
IJECIDEA RHIZOCARPIZA Zahlbr.
Leeidea rhizocarpiza Zahlbruckner, Deutsche Siidpolar Exp., 8, 36; 1906.
Type: Kerguelen, between Station and Mittelberg, Werth (Deutsche Siidpolar Exp.).
Thallus epilithic, very thin, forming plaques up to 3 mm. broad, irregular, discrete or some-
what confluent, lead to monse colonred, somewhat winkled and rimnlose, I< yellowing then red-