LICHENS AND LICHEN. PARASITES

180 B.A.N.Z. ANTARCTIC! RESEARCH EXPEDITION
filled with very minute crystals; asci cylindric at first with a narrow papilla in the gelified tip,
55 X 6-7p then becoming broadly clavate and finally subspherical and thin-walled, 75-18p in
diameter, as the maturing spores form at the top of the ascus; ascospores hyaline, 2-celled,
ellipsoid, thin-walled, 10-12 X 4-$.
Growing with Lecanora altrocaesia8, Usnea sect. Neuropcyon sp. and BuelLia. mbplicata.
Heard Island : between Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. B140-27, type.
LECANIA KERGUELENSIS Dodge, sp. nov.
? Lecanora untbrina Crombie, Jour. Linn. Soc. Bot., 15,185 ; 1877 : Phil. Trans. Roy Soc. [London],
168, 49 ; 1879 : Rept. Sci. Results Voy. "Challenger" Bot., 1, 2, 235 ; 1885 : Miill.-Arg., Bot.
Jahrb. [Engler], 4, 137 ; 1884 non (Ach.) Mass.
Type : Kerguelen, Royal Sound, Long Island, B.A.N.Z.A.R.E. B167-1.
Thallus areolis 0.5 mm. diametro, vel minoribus, olivaceus, ecorticatus ; algae protococcoideae,
cellulis 7-8p diametro, coloniis parvis inter hyyhis medullaribus verticalibus, ca. 3p diametro,
leptodermeis. Apothecia 0.1-0.2 mm. diametro, immersa dein sessilia vel subelevata, disco
convexiusculo, umbrino, margine tenui, laevi ; amphithecium evolutum, parathecium deest ;
hypothecium 20p crassitudine, hyphis tenuissimis, dense contextis ; thecium 55-GOp altitudine ;
paraphyses tenues, pachydermae, septatae, simplices vel bifu~catae, ad apices non incrassatae;
asci cylindrici, juventute pachydermei, apicibus incrassatis, 4044 X 10-12p ; ascosporae octonae,
aciculares, distichae, 6-loculares, 14 X 2 ~5-3p.
Thallus reduced to small, round areoles, about 0-5 mm. in diameter, or less, ecru olive;
ecorticate ; algae protococcoid, cells 7-8p in diameter in small colonies between vertical medullary
hyphae, with other very small, more or less cylindrical or irregular colonies of Nostoc?, cells
34p in diameter at the surface, and also penetrating between the medullary hyphae to consider
able depth ; medullary hyphae vertical, about 3p in diameter, thin-walled.
Apothecia 0.1-0.2 mm. in diameter, often 34 per areole, immersed at first, then sessile or
somewhat elevated, disc slightly convex, burnt umber, or darker, margin thin, smooth, finally
almost disappearing as the apothecia are concrescent into masses up to about 0.5 mm. in diameter,
when they practically cover the whole areole; amphithecium present, parathecium not differen-
tiated; hypotheciuin about 20p thick, of very slender, closely woven hyphae; thecium 55-60p
tall; paraphyses slender, thick-walled, septate, simple or once forked near the apex, tip not
enlarged, in the thecial gel ; asci cylindric, 8-spored, thick-walled and tip considerably thickened
until the spores matnre, 40-44 X 11-12p ; ascospores, acicular, distichous, 6-celled, 14-15 X 2 5-3p.
This very inconspicuous species on decayed grass along with Lecawra brkcha has been very
sparingly collected. The penetration of the thallus by colonies of Nostml is apparently similar to
that observed in Aspiciliopsak and Placopsis, although not stimulating the formation of cephalodia.
Kerguelen : Royal Sound, Long Island, B.A.N.Z.A.R.E. B167-1.
LECANIA JORNS~NI Dodge, sp. nov.
.- Type: Macquarie Island, Featherbed Flat, B.A.N.Z.A.R.E. B533-1.
Thallus crustaceus, uniformis, rimoso-areolatus, superficie minute verrucosa vel glebulosa,
grisea; ecorticatus; stratum algarum ca. 100p crassitudine, protococcoideum, cellulis sphaericis,
11-14p diametro; medulla hyphis 2p diametro, ramosis, laxe contextis Apothecia ad 1 mm.
diametro, basi subconstricta, disco olivaceo nigricanti, plano vel concavo statu sicco, margine sub-
elevato, laevi, eubcrenulato, colore thalli vel dilutiare; cortex 35-45p crassitudine, subfastigiatus