LICHENS AND LICHEN. PARASITES

L3.A.N.Z. ANTARCTIC! RESEAHCII EXPED1TlO.L'
BUELLIA DENDRITICA Dodge & Baker.
Bt~elZicc dendritica Dodge & Baker, Ann. Mo. Bot. Gard., 25, 651 ; 1938.
Type : King Edward VII Land, Roclrefejler Mts., Mt. Helen Washington, P. Siple, F. A. Wade,
S. Corey & 0. D. Stancliff HW-18.
Thallus covering areas 5-8 mm. in diameter, closely attached to the rock; non-assimilative
areas 5OP thick, more or less continuous, but sometimes open-reticulate, margins fimbriate or
aendritic, or sometimes of only a few rugose strands, black ; cortex of large, dark cells ; medulla
not differentiated morphologicitlly but composed of hyaline cells more loosely arranged, basal
layer not distinct from the upper cortex; assimilative areoles up to 0.6 mm. in diameter, circular
to elongate, dark olive brown to black at matnrity, much lighter when young, few, scattered;
cortex up to 1 2 thiclr, ~ of large, fastigiate cells continuous over the top, covered with a layer of
dead cells up to 1 5 thick; ~ algae abundant, scattered throughout the areole; medulla 5OP 01.
more thick, of coarse, interwoven hyphae; basal layer 10-15r thick, of compact brownish pseudoparenchyma.
Apothecia up to 0.33 mm. in diameter, subspherical to flattened, sometimes with a faint margin
of whitish cells, usually single, covering a whole areole, black; parathecium scarcely differentiated,
the sides of the thecium covered by a layer of dark pseudoparenchyma, 1 5 thick, ~ continuous with
the cortex of the areole ; hypothecium about 2OP thick, hyaline or faintly brownish, of thin-walled
pseudoparenchyma; thecium up to 110~ tall; paraphyses about lp in diameter, much branched
above, tips thickened to 3~, slightly darkened on outer surfaces, epithecium about lop thick,
rugose, dark, K faint greenish ; asci 35-53 X 13-lap, long clavate, becoming shorter and stouter
at maturity, usually $-spored (occasionally 6-, 4-, or 2-spored with a corresponding increase in the
size of spores) ; ascospores bilocular, somewhat constricted at the septum, sometimes unilocular,
slightly pointed or blunt, dark brown, 8-10 (-13) X 5-6. (-7.5)~.
Our material is very young, no mature spores have been found. The assimilative areoles are
lighter coloured than in the type (naphthalene yellow, some being dead white, as if the tops had
been eroded by snow crystals). The habit is the same and such characters as are observable
agree with this species.
Queen Mary Land : Hippo Nunatak, C. T. Barrisson, A.A.E. 65-2.
BUELLIA MCLEANI Dodge, sp. nov.
Type: King George V Lalid : Mt. Murchison, 1,860 ft., A. L. McLean, A.A.E. 52.
Thallus crustaceus subeffiguratus, griseo-niger, hypothallo nigro, centro areolato, inargine
tenuescente, confel-voideo; areolae assimilantes 0-2 (-0.3) mm. diametro, 75r, crassitndine,
pulvinatae, rotundatae vel angulares, olivaceae obscurioresve, aut cortice eroso dein albidae;
cortex ca. 2OP crassitudine, laxe capitato-fastigiatns, strato amorpho 8-lor, tectus; algae cystococcoideae,
ad lor. diametro per medullam laxe contextam sparsae, snper baaim 200~ crassitndiiie,
dimidia parte superiori brunnea, pseudoparcnchymatica, dimidia parte inferiori carbonacea.
Apothecia 0.3 mm. diametro, applanata dein coiivexa, margine laevi nigro, thallo immersa cum
margine albido cellularum corticalium emortnarum dein magis elevata ; paratheci~un ca. 4OP in
lateribus crassitudine, infra ab baei non bene evolutnm; hypothecium ca. 35r,. crassitudine,
hyalinum dein viridi-nigrum, hyphis tenuibus verticalibus; thecium ca. 55-6OP altitudine, snbviride;
paraphyses tenues, repetito-dichotom'e ramosae snper ascos, ramis ultimis tricellularibus,
submoniliformibus, cellulis exteris nigricantibns, ellipsoideis, ca. 6 X 4r,, epithecio nigro 8-15~
crassitudine; asci clavati 30 X juventnte apicibus incrassatis, protoplastis truncatis, mamillis