LICHENS AND LICHEN. PARASITES

B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
Apothecia lecanoiine
Cortex fastigiate, pse~ldoparenchymatous
Medulla loosely $oven ~vithout chondroid strands Pol ycauliona
Medulla compact with central chondroid strand of conglutinate, loiipitudinal
hyphae . . . . . . . . . . Letharia psi!:
Cortex of longitudinal hyphae ; medulla very loosely woven, often hollow in the
centre . . . . . . . . . . Teloschiste~
Spores 3-4-celled, protoplasts nearly spherical, coniiected by isthmi; thallus crustose
PWTOBLASTENIA Steiner.
Protobla,qtenia Steiner, Verh. Zool. Bot. Ges. Wien, 61, 47; 1911.
Trioyhthalmidiunt
Blastenin snbg. E'rotoblastenia Zahlbr. in Engler & Prantl, Die Nat. Pflanzenfam. I., 1, 226; 1907.
Type: P. rupestris (Scop.) Steiner.
Thallus crustose, uniform, ecorticate ; algae protococcoid. Apothecia sessile or iininersed with
well developed parathecium; hypothecium light or dark; paraphyses simple, asci 8-spored; asco-
spores hyaline, unicellular. Spermatiophores closely septate; spermatia short, straight.
PROTOBLASTENIA CITRINA Dodge, sp. nov.
Type: Queen Mary Land, Alligator r\'unatak, C. T. Harrisson, A.A.E. 38.
Thallus granulosus, indeterminatus, granulis sphaericis, 10-100p diametro, plus minusve
erosis, flavis, ecorticatis; algae protococcoideae, cellulis 8-10p diametro, graiiula implentibus,
coloiliis hyphis medullaribus tectis. ,4pothecia ad 0.3 mm. diametro, disco convexo, citrino vel
obscuriori, margine tenni, laevi, non elevato ; par athecium 20p crassitudine, hyphis tenuibus conglutinatis;
hypothecium centro 30p crassitudine, hyphis tenuibus dense contextuin; thecinm 3Sr
altitndine ; paraphyses tenues, pacliydermeae, super ascos ramosae, ramis monilifoi~nibns, apicibus
ilon incrassatis, crystallis flavidis inspersis; asci clavati, maturitate subinflati, apicibus non conspicue
incrassatis; ascosporae uuiloculares, hyalinae, ellipsoideae, 6-7 X 3p.
Thallus granular, indeterminate, composed of spherical granules 10-100p in cliameter, surface
often erodcd and appearing sorediose under low magnifications bnt not truly so, lemon chrome;
cortex absent, represented by conglutinate medullary hyphae surrounding the algal colonies; algae
protococcoid, cells 8-10p in diameter, lodsely packed, filling the granules.
Apothecia up to 0.3 mm. in diameter, disc convex, citrine to dark citrine; margin thin, smooth,
not elevated ; parathecinm 20p thick, of conglutinate, slender hyphae ; hypothecium 30p thick in the
centre, thinning toward the margin, of densely woven, deeply staining, slender hyphae; thecium
35p tall ; paraphyses,slender, relatively thick-walled, branching above the agci, branches someulhat
moniliform, tips not thickened but densely incrusted with yellowish crystals; asci clavate, somewhat
inflated at maturity, tips not conspicuously thickened ; ascospores u~iiccllular, hyaline, ellipsoidal,
6-7 X 3p.
The systematic position of this species is somewhat uncertain as no spermagoilia have been
found. Only the type is sparingly fertile, and in the one apothecium sectioned, very few asci have
matured spores. The other specimens have been referred here from thalline characters.
King George Land: Cape Denison, A.A.E. 42, 179, 180, 181, 182, B.A.N.Z.A.R.E. 536-40,
536-11, 536-43.
Queen Mary Land : Alligator Nunatak, C. T. Harrisson, A.A.E. 28-2, type; Possessioii IQunatak,
C. T. Harrieson, A.A.E. 42; David Island, C. T. Harrisson, A.A.E. 40, 73; Hippo Nu~iatak,
C. T. Harrisson, A.A.E. 78-1, 79.
MacRobertson Land : Cape Bruce, B.A.N.Z.A.R.E. 108-24,108-2.5.