LICHENS AND LICHEN. PARASITES

231 B.A.N.Z. llNTARCTIC REBEARCH EXPEDITION
epithecial gel with a few inclosed tninute crystals ; asci a rhombus in optical section with slightly
rounded tip, 8-spored, about 55 X 4p, thin-walled; ascospores polari-bilocular, 14-15 X 6-7,~,
broadly ellipsoicl, protoplasts hcmispheric, joined by a narrow isthmus.
The relationship of this species is somewhat puzzling. Since the algae do not penetrate the
apothecium above tlie lower surface of the parathecium, it is suggestive of Blasteniu, but thc
greatly constricted base of the apothecium with well defined cortex outside the algal layer point to
its inclusion with Pyrcnodesnzia. Nylander's clescription of this species is very brief aiid T have
hesitated to refer our material here, although it agrees well with such characters as Nylander
gives. It is also somewhat suggestive of Blastenin fermyinea f. lezwophlo~u (Krmplhbr.) hliil1.-
Arg. from Chathain Island, but has a thicber, more coloured thallus and slightly larger ascospores.
On rock with Buellia. Mawso?li.
Macquarie Island, Featherbed Flat, B.A.N.Z.A.R.E. B533-8.
PYRENODESMIA MAWSONI Dodge, sp. nov.
Type : MacRobertson Land, Cape Bruce, B.A.N.Z.A.R.E. 108-27.
Thallus squainulis pulvinatis 0.2-0.5 mm. diametro super muscos crescens, margiiiibus laeribus;
cortex cn. 35p crassitndine, fastigiatus, hyphis pachydermeis septatis basim versus male
evolutus; algae protococcoideae, cellulis sphaericis, 8-10p diametro; medulla hyphis dense contextis
cum lacmiis subsphaericis ad centrum. Apothecia frequenter totam squamalam tegentia,
disco plano flavo-brunneo; amphithecium ad 200p crassitudine, cortex cum eo thalli continuus et
ei similis; parathecium non evolutum; hgpothecium ca. 20p crassitncline a thecio male distincto;
thecium ca. altitudine ; paraphyses tenuissimae, sub apicibus furcatae, cellulis terminalibus
clavatis vel ellipsoideis, 6 X 3p hpalinis, leptodermeis; asci cylindrici, apicibus incrassatis,
50-55 X 8-lop; ascosporae monostichae, hyalinae, late ellipeoideae, polari-bilocularea, 10-11
X 7-8!~, protoplastis hemisphaericis, isthmo jnnctis.
Thallus of small, pulvinate squamules, 0.2-0-5 mm. in diameter, growing over the tops of
mosses, margin smooth; cortex about 35p thick, fastigiate, of thick-walled, septate hyphae, lees
clearly differentiated toward the base ; algae protoccoccoid, nearly filling the interior of the thallus,
cells spherical, 8-lop in diameter, densely packed above and on the sides, cells fewer toward the
centre and base ; medulla compactly woven hyphae with sitbsperical lacunae in the central portion.
Apothecia often covering the whole squamule, disc plane, yellowish brown ; amphithecium
about 200p thick, cortex continnous with that of the thallus ancl of the same structure, algae filling
the rest of the amphithecium; parathecium not differentiated; hypothecium about 20p thick, of
very slender, vertical hyphae, resting on the algal layer and not sharply differentiated from the
theciuin above; thecium about 75p tall; paraphyses very slender, furcate just ,-below the tips.
terminal cells clavate to ellipsoidal, about 6 X Sp, thin-walled and hyaline; asci cylindric or
nearly so, 50-55 X 8-lop, tips thickened ; ascospores monostichous, hyaline, broadly ellipsoidal,
polari-bilocular, 10-11 X 7-8p, protoplasts hemispheric, joined by an isthmus.
a
Growing over tops of mosses.
MacRobertsoii I~aild : Cape Bruce, B.A.N.Z.A.R.E. B108-26, B108-27.
GASPARRINIA Tornab,
Gasparriniu Toriiabene, Lichenogr. Sicula, 27 ; 1849.
Arnphilonlu Icoerb., Syst. Lich. Germ., 110 ; 1854 : non Parnzelia sect. An~plzilonzu Fr., Lichenogr.
Eur. Reform., 87; 1831.
Aglaop'mzu DNtrs. in Bagl., Mem. Accad. Sci. Torino II., 17, 396; 1856.