LICHENS AND LICHEN. PARASITES

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B.il.S.2. ANTSRCTIC RESEARCH EXPEDITION Spores 3.5-5p in diameter ; asci 23-31 6-9p Cortex 12p thick; apotliecia 0.25-0-3 mm. in diameter; hypothecium 20p thick ; ascospores 6-6 - 5 X 3 .55~ . . . . L. Painei Cortex 20p thick; apothecia 0.4-0.7 mm. in diameter; hypothecium 150- 180p thick; ascospores about 8 X 4p . . . . L. MacLenni Hypothecium hyaline Spores 10-12p long Spores 3-5p in diameter; asci (20-) 32-40 X 12.5-16p; thecium 60-70p tall; epithecium K green. . . . . . . . . . , L. Wadei Spores 5-8. 5p in diameter Paraphyses 1-0-1.5p in diameter, not capitate; epithecium K-; asci 30- 44 X 14-16 (-2O)p . . . . . . . . L. Byrdii 0 Paraphyses 0.75-l.Op, capitate; epithecium K green; asci (41-) 48-62 ( -70) X 15-18p . . . . . . . . . . L. Siplei Paraphyses 34p, not capitate . . . . . . L. eburnea Spores 7-llp long Spores 5-6p in diameter; epithecium K-; thecium 55-60p tall Apothccia 0.3-0.5 mm. in diameter; spores 8-lop long L. rupicida Apothecia 0-675 mm. in diameter; spores 10-llp long L. Byrdii Spores 3-5p in diameter; epithecium K green Thecium 35p tall; apothecia 0.2 mm. in diameter; parnphyses with clavate tips; hypothecium 20p thick; parathecium not clearly differentiated L. Harrissoni Thecium 50-60 (-70)p tall; apothecia 0-2-0.25 mm. in diameter; paraphyses not capitate; hypothecium 30p thick; parathecium 40p L. capsulata Thecium 70p; apothecia 0 -6 mm. in diameter; paraphyses capitate, heads 4-5p; hypothecium 3 0 thick; ~ parathecium not differentiated L. Stanclifl LECIDEA LASERONI Dodge, sp. nov. Type: King George V Land, Madigan Nunatak, 30 miles east of Winter Quarters, C. F. Laseron, A.A.E. 41-1. Areolae parvae, elevatae, 1 mm. altitudine , obscure olivaceo-alutaceae ; strato amorpho circiter 1 8 crassitudine; ~ cortex circiter 20p crassitudine, pseudoparenchymate fusco; stratum algarum 45-50p crassitudine, protococcoideum, coloniis discretis compactum, cellulis 7-8p diametro; medulla hyphis tenuibus laxe contexta, 2p diametro. Apothecia conferta in apicibus areolarum, basi constricta, nigra, nitida, 0.5 mm. diametro, excipulo prominente, disco plano ; parathecium carbonaceum, 150p crassitudine. cellulis isodiametricis, pachydermeis, fuscis, 4p diametro ; hypothecium inconspicuum, circiter 20p crassitudine, hyphis tenuibus, vertiealibus ; thecium 25-30p altitudine ; paraphyses tenues, apicibus clavatis, nigria, 2.5p diametro; asci late clavati, 26 X 10-12p ; ascosporae unicellulares, hyalinae, longe ellipsoideae, vaginatae, 7-8 X 2.5- 3t.4 (vagina inclusa) . Thallus mostly between and below quartz crystals, on the surface of the rock, largely confined to small, elevated areoles about 1 mm. tall, bearing several crowded apotheeia at their tips, dark olive buff or darker ; outer amorphous layer about 18p thick, cortex about 20p thick, of dark brown pseudoparenchyma; algal layer 45-SOp thick, of compact, discrete colonies of Protococc~~s, cells 7-8p in diameter; medulla of slender, loosely woven hyphae about 2p in diameter.
DODGE-LICHENS AND LICHEN PARASITES 99 Apothecia crowded on the tops of the areoles, constricted beneath, black, shining, mostly about 0.5 mm. in diameter (proliferating ones up to 1 mm.), exciple prominent, disc remaining flat (or concentrically gyrose from proliferation of new small apothecia from the disc of the old one) ; parathecium carbonaceous, 150~ thick, of isodiamctric, thick-walled, dark brown cells, about qLr in diameter; hypothezium inconspicnnus, about 2OP thick, of very slender subvertical hyphae, epithecium greenish-blue when first sectioned, fading on standing; thecium 25-3OP tall; paraphyses, slender, wall. gelified, once branched above the asci, tips clarate, black, about 2 .5~ in diameter; asci broadly clavate, 26 X 10-12p, wall aboiit 4~ thick, protoplast papillatc at first, becoming clavate; ascospores unicellular, hyaline, long cllipaoidal with a broad sheath, 7-8 X 2.5-3~ (including sheath). This species is intermediate between L. Coreyi which it resembles in several microscopic characters, and L. Blackblrrni and L. rwpicida which it resembles in habit. Icing George V hand, Madigan Nunatak. 2,400 ft., 30 miles east of Winter Quarters, C. F. Laseron, A.A.E. 41-1. LECIDEA BLACKBURNI Dodge & Baker Lecidea Blackbllrnl Dodge & Baker, Ann. Mo. Bot. Gard., 25, 540; 1939. Type : South Victoria Land. Queen Maud Mts., Mt. Scudder, 86" 03' S., 150" 40' W., Q. A. Blackburn, R. S. Russell, Jnr. & S. D. L. Paine QM-6 (2). Non-assimilative portion a few black strands composed of dark, irrrgular hyphae, clendritic, extending over areas 4-3 mm. in *diameter; assimilative portion up to 0.75 mm., irregularly areolate, soft to gelified when moist, pale olive buff to citrine drab ; col-tes 10-18p thick, of several layers of small, fastigiate cells, light to dark-brown in the outer layers, the whole covered by n layer of dead cells, up to 2OP thick; algal layer 90-10OP thick, cells up to 1 5 in ~ diameter, closely packed; medulla up to 850~ thick, of slender hyphae 1-1.5~r in diameter, reticulately arrangecl, more compactly so about the algae; lower cortex absent. Apothecia up to 0.5 mm. in diameter, irregularly elliptical to circular in outline, more or less flattened with a distinct margin, sessile, closely crowded or scattered, black, somewhat shining; parathecium consisting of a few cells merging with the marginal cortex which is well developed, up to 2 5 thick, ~ of large, isodiametric cells, carbonaceous, fusing with the epithecium above and the thalline cortex below; hypothecium 60-70r, thick, fuscous brown slightly thinning toward the margin, of thick-walled pseudoparenchyma; thezium 50-9OP tall; paraphyses lp in diameter, heads up to 3~r, darkened, without incrustations, uiibranched or branched near the tips, epithecium 8-12~, thick, carbonaceous, rough, turning green with K; asci (37-) 52-60 X 9-1lP, 8-spored, long, slender clavate, expanding gradually from the attenuate base (not abruptly as in L. cancriformis) ; ascospores 6 5-8.5 X 2-2. Sp, ellipsoidal, unicellular. A few weathered thalli seem to belong here although the spores are somewhat larger. The . above description was based on the type. King George V Ln~ld: Madigan Nuntak, 2,400 ft., C. I?. Laseron A.A.E. 25-1. LECIDEA CANCRIFORMIS Dodge & Baker Lecidea cancriformis Dodge b Baker, Ann. Mo. Bot. Gard., 25, 539 ; 1938. Type: South Victoria Land, Queen Maud Mts., Mt. Scudder 86" 03'S., 150" 40' W., Q. A. Blackburn, R. S. Russell, Jnr. & S. D. L. Paine QM-6 (2). Thallus areolate, 11p to 0.5 mm. wicle, usually in long strands bearing several apothecia, greyish white, gelified when moist, irregular in shape, more or less verrncose, small and inconspicuous in comparison with the apothecia ; upper cortex 2-8~ thick, brownish, of small fastigiate
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phaeospora Hepp, Flecht. Eur., 947
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INDEX. For convenience of reference
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LICHENS AND LICHEN. PARASITES

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