LICHENS AND LICHEN. PARASITES

96 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
Type: ICerguelen, Observatory Bay, A. E. Eaton (Venus Transit Exp.).
Thallns very thin, greenish ashy from a minute chroococcoid alga, appearing minutely rough
from the fractured surface of the rock, K yellow, drying somewhat tallmy; algae protococcoid,
cells 7-6p in diameter, splie~.ical, replaced in part by the rery minute chroococcoid alga. Apothecia
sessile, black. up to 1 nnn. in diameter, clisc plane to slightly convex, margin inrolled, thin, prominent,
smooth to slightly mldnlate; parathecium carbonaceous, 110-1Wp thick at the margin, of
va~.iable thickness under the hypothecium, up to 130~; hypothecimu not differentiated; thecium
I 10-120p tall : paraphyses slender, moniliform, once or tjvice dichotonlously branched just above
the asci, e11c1ing in a tuft of short, moniliform, bro~vnish branches in the epithecial gel; asci
55-60 X 10-lip, cylindric, tip thickened, protoplast with a rery small papilla ; ascospores monostichons,
11:-alilie, ~uiicellnlal., ellipsoid, 12-15 X G-~P, with moderately thick walls. [Spermogoliia
111inute. 1111 to 0.5 mm. broad, not prominent, black; wall f~lliginons, dimidiate ; spermatiophoi-cs
little h~anchecl, oblong, cylindric, shorter tllan the sperlllatia n-hich are curved to hamate,
14-20 X lp] .
Growing with En~~ephalographa cerebrinella, Lecidea crsboludes, L. Anberti, Catillaria kerg~relensis,
Rltizocarpon kerg~ielense, Pertzisaria subpevri~~tosa, Aspicilia disjunguenda, A. endochlora,
Leccr)torrr ntrocaesia, Aspiciliopsis macrophthalnta and Buellia tristiuscda
Ke~guelea : Greenland Harbour, B.A.N.Z .A.R.E. B177-15, B177-31, B177-32, B20C6,
B204-7; Observatory Bay, B.A.N.Z.A.R.E. Bl92-19; Murray Island, B.A.N.Z.A.R.E. H210-3;
Mt. Wyville Thompson, 1,000-1,500 ft., B.A.N.Z.A.R.E. B246-5.
Heal-(1 Irlaild: between Atlas Cove and Corinthian Bay, H.A.N.Z.A.R.E. B140-17.
LECID~ ASSENTIENS Nyl.
T~acidea asse~rtiens Nyl. in Crombie, Jour. Bot. Brit. For., 13, 334; 1875; 15, 105; 1877: Jour.
Linn. Soc. Bot., 13, 187 ; 1876 : Phil, Trans. Roy. Soc. [London], I GS, 50 ; 1879 : Rept. Sci.
Results T'o-. " Challenger" Bot., 1, 2, 237; 1885 : Zahlbr., Deutsche Siidpolar Exp., 8, 36 ;
1906.
Lecidea conptrens Hook. f. & Tayl., London Jour. Bot., 3, 636 ; 1844 non Ach.
Lecidea cont;g~rct v. hydrophila Bab. in Hook. f., Crypt. Antarct., 232; 1845 : Fl. Antarct., 2,538;
1847 fide Crombie, Jour. Bot. Brit. For., 15, 105; 1877.
Type: IZerguelen, Royal Sound and Observatory Bay, A. E. Eaton (Venus Transit E~P.).
Thallns epilithic, effused, thin, ashy td deep olive, minutely rimose areolate, snrrounded by a
narrow dark line, K y~llowing; cortex 35p thick, of coarse thin-walled, periclinal hyphae; algal
layer 7 5 thick, ~ of discrete colonies of protococcoid cells, somewhat angular, mostly 7-lop in
diameter; medulla 150p thick, loosely woven and enclosing rock crystals. Apothecia black, sessile,
solitary or confluent in dense clusters, round or angular by mutual pressure, 0.5-0.7 mm.
in diameter, disc plane or nearly so, margin elevated; parathecinm 35-40~ thick, carbonaceous,
of thick-walled, periclinal hyphae extending under the hypothecinm and just above the algal layer
of the thallns; hypothecium and just above the algal layer of the thallus; hypothecium lenticular,
about 5 5 thick ~ in the centre, composed of loosely woven, light brown hyphae; thecium
about 75-90p tall; paraphyses slender, imbedded in the thecial gel, scarcely septate below, dichotomously
branched in the upper third, more frequently septate, terminal cell dark brown,
spherical, about 4p in diameter; asci 35 x 10p tip thickened when young with broadly papillate
protoplast, becoming thin-walled at maturity, c$indric; ascospores sub-distichous, hyaline,
broadly ellipsoidal, 9-12 x 6-8p. [Spermogonia black, immersed ; wall fuliginous, dimidiate ;
s~ermatiophores fasciculate, short ; sterigmata arcnate to hamate, 9-14 X lpl.