LICHENS AND LICHEN. PARASITES

DODGE-LICHEN8 AND LICHEN PARABITES 163
diametro, lecanorina, basi constricta, excipulo laevi, albo, disco concaviu.sculo, albo pruinoso,
multis theciis continente; cortex amphithecialis circiter R5p crassitudine plus minusve fastigiatus,
hyphis pachydermaticis ramosis, cellulis isodiamttricis ; stratum algarnm circiter 40p crassitudine,
cellulis protococcoideis, 7-8p diametro, dense ccmpactis; parathecinm 50-60p crassitndine, hyphis
tenuibus, periclinalibus, pachydermaticis; hyprthecium non bene evolutum; thecium 550-600p
altitudine ; paraphyses tenuissimae, ramosae ; asci ellipsoidei, leptodermatici, monospori ; asco-
sporae uniloculares, subluteae, 185-225 X 110-135p, hyalina cum vagina 15p crassitudine. Spermo-
gonia subsphaerica, vel subirregularia, murus 20p crassitudine; spermatiophorae tenues, ?emel vel
bis dichotomae, pauci-septatae, circiter 20 X 1p; spermatia elongata, fusiformia, recta vel sub-
incurva, 7-8 X lp.
Thallus thick, snbfoliose, investing mosses, fnrming a plaque at least 2 cm. in diameter, white,
surface badly eroded, margin lobate, lobes rounded, about 1 mm. broad and 2-3 mm. long.
Apothecia about 1 mm. in diameter, lecanorine, constricted at the base, exciple smooth, white,
disc concave, white pruinose, containing many _thecia (as in Chwdectm) ; amphithecial cortex
35p thick, more or less fastigiate, of thick-walled, branched hyphae with isodiametric cells; algal
layer about 40p thick, of densely packed, protococcoid cells, 7-8p in diameter, disappearing above
as the apothecium matures ; parathecium 50-60p thick, of periclinal, slender, thick-walled hyphae ;
hypothecium not clearly differentiated from the parathecium ; thecium 550-600p tall ; paraphyses
very slender, branched, enclosing each ascns in a dense tissue; asci ellipsoidal, thin-walled, mono-
sporous; ascospores unilocular, slightly yellowish, 185-225 X 110-135:~, with a hyaline sheath
about 15p thick.
Spermogonia forming in regenerating thecia after the discharge of ascospores, subspherical
to somewhat irregular, wall 20p thiclt, very deeply staining; spermatiophores slender once or twice
dichotomous, very sparingly septate, about 20 X lp; spermatia long-fudform, straight or slightly
curved, 7-8 X 1p.
Growing over the tops of a coarse moss on dry roclts. Unfortunately our material is very old
and eroded, but is much nearer foliose than any other species of this family with which I am
familiar. Our species seems closest to Pertusaria c reberrima Stirt. and P. circumcincta Stirt. from
New Zealand. It differs from these in the much larger spores and thicker, lobate thallus.
Kerguelen: Observatory Bay, B.A.N.Z.A.R.E. B188-2, type; Mt. Wyville Thompson,
1,000-1,500 ft., B.A.N.Z.A.R.E. B246-9, R246-10, B246-11; near Port Jeanne d'Arc, 1,400 ft.,
B.A.N.Z.A.R.E. B200-5, R217-3 ; Long Island, Royal Sound, B.A.N.Z.A.R.E. R953-3.
LECANORACEAE.
Thallns crustose, uniform or with effigurate margins, rarely dwarf frnticose, branched, attached
to the substrate by hyphae of the medulla without rhizinae, heteromerous (except in Harpidiunt) ;
ecorticate or corticate; algae protococcoid. Apothecia immersed, sessile or short stalked, round;
amphithecium usually well developed (apparently absent in Candelariella cerebriformis) ; para-
thecium usually poorly developed or absent; hypotliecium hyaline, nsually with algae below;
paraphyses unbranched and free or branched and intricate; asci usually %spored, rarely poly-
sporous; ascospores, hyaline, rarely brown, I-, 2-, or more-celled, or many-celled muriform,
thin-walled.