LICHENS AND LICHEN. PARASITES

DODGE-LIUHENS AND LICHEN PARABITEB 63
sT'cl.veolens; A. rhodopis has been reduced to a variety of A. epulotica. The rest are still recog-
llixed as species in Magnueson's monograph (Medd. Giiteborgs Bot. Tradg., 8, 147; 1933), and
any one of them would conserve the name in its usual sense.
Thallus crustose, uniform or determinate, endo- or epilithic, with or without hypothallus;
I~omoeomerous with Trentepohlia algae. Apothecia imnlersed with a more or less well developed
pnrathecium, disc plane or concave, dark to blackish, s~nall; paraphyses simple or occasionally
bl-nnched, usually in the upper part, imbedded i11 the thecial gel, more or less distinctly septate; asci
clavate, with 8 unicellular, hyaline, ellipsoid, thin-walle(1 ascospores.
Apparently the first record of this genus from the southern hemisphere, previously recorded
species having an Arctic-alpine distribution in Eurasia. The algal cells are smaller than i11 pre-
riollsly recorded species and the parathecium is much thiclier and more carbonaceous below.
IONASPIS KERGUELENSIS Dodge, sp. nov.
Type : Kerguelen, Observatory Ray, B.A.N.Z.A.R.E. B192.
Thallus ad 2 cm. diametro, nigromarginatus, aulici-griseus vel gnaphali-viridis, rimosoareolatus,
K-; homoeomerus, circiter ZOOp crassitudine, strato extero 40p crassitudine nigro (sed
probabiliter ecorticatus) ; algae Trentepohlia, filamentis 6-10p diametro, celldis triplo vel quadruplo
diametro longioribus, saepe singulis, laxe dispositis inter hyphas tenues medullares. Apothecia
immersa, urceolata, thallo circum marginem nigrato; parathecium 55p crassitudine sub
margine ad 25p infra hypothecinm panlo evolutum tenuescens; carbonaceum ; thecium 75-SOp altitudine
; paraphyses tennes, paene eseptatae, semel ramosae, cellulis apicalibus moniliformibus paulo
incrassatis; asci clavati, 55 x gp, Ie~todermatici; ascosporae octonae, uniserialiter dispositae,
ellipsoideae, 9-10 X 7-gp, unicellulares.
Thallus about 2 cm. in diameter with a conspicuous black margin about 1 mm. broad, formed
by the dendroid strands of the hypothallns; otherwise court-grey to Gnaphalium green, rimose
areolate, K-; homoeomerous, about 200p thiclr, upper 40p blackened, obscuring the structure but
probably ecorticate; algae Trentepohlia, filaments ?'-lop /in diameter, mostly disintegrated
into cylindrical cells of varying size, 34 times as long as broad, loosely arranged between slender
medullary hyphae. Apothecia immersed, nrceolate, with the thallns blackening about the apotbecial
margins; parathecium 55p thick at the margin, thinning to about 25p thiclr below the
scarcely developed hypothecium, wholly carbonaceous; thecium 75-8OP tall ; paraphyses slender
scarcely septate below, once forked below the epithecium, the ultimate cells moniliform.
darkened and slightly thicker than the rest of the paraphysis; asci &spored, clavate 55 X 9p,
thin-walled ; ascospores uniseriate, ellipsoidal, hyaline, unicellular, 9-10 X 7-8p.
B192-16 and B192-17 are stained ferruginous from the substrate. Except for the symbiont,
this species seems close to the description of Lecidca endocyanella Zahlbr. of which I have seen no
,
material.
On rocks with Leeklea phaeosioma,, Aspkiliopsis ntacrophthdma, (rasparrinia depauperda,
Baellia subplicata and B. tristiwda.
Kemlelen: Observatory Bay, B.A.N.Z.A.R.E. B192-13, B192-14, B102-15, R192-16,
B192-17 ; upper part of Greenland Harbour, B.A.N.Z.A.R.E. B177-17.
Heard Island: Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. B140-10.
IONASPIS MAWSONI Dodge, sp. nov.
Type : Kerguelen, Observatory Ray, B.A.N.Z.A.R.E. B192-18.
Thallus tenuis, circiter 300p ~r~itndine, continuns vel rariter irregulariter subrimulosus,
dilute rubro-alutaceus vel dilute griseus, margine tenni, nigro; strato extero nigrescente, 15p
crassitudine, evidenter sudete cellnlortun gelifactornm; algae T~entepohlia, filamentis 7-8p