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164 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION<br />
Ascospores unicellular<br />
Thallus indeterminate<br />
Apothecia immersed<br />
Asci 8-spored, thallus grey or brown . . . . . . . Aspicilia<br />
Asci polysporous, thallus yellow . . . . . . . . Candelariella<br />
Apothecia sessile, at least the margin elevated above the thallus . . Lecanora<br />
Thallus determinate, margin usually lobed<br />
Without cephalodia ; apothecia more 0:- less stallred . . Lecanora sect. Placodiuna<br />
Cephalodia usually large and conspicuors, apotheciiform<br />
Apothecia immersed . . . . . . . . . . Aspiciliopsis<br />
Apothecia sessile , . . . . . . . Placo psis<br />
Ascospores 2-celled (rarely pluri-septate)<br />
Thallus grey or brown<br />
Thallus crnstose . . . . . . . . . . . . . . Lecanio<br />
Thallus dwarf fruticose . . . . . . . . . . Thammlecania<br />
Thallus yellow . . . . . . . . . . . . . . Candelariella<br />
ASPICILIA Mass.<br />
Aspicilia Massal., Ricerche Autonom. I~ich. Crost., 36; 1852.<br />
Lecanora sect. Aspicilia Stzbgr., Ber. Thatigk. St. Gall. Naturw. Qes., 169 ; 1862.<br />
Type : Of the eight species originally included by Massalongo, four (Lichen polygonius Vill.,<br />
Urce801& cinsreo-rufescens Ach., A. ochracea (Schaer.) Mass. and A. scutellaris (Schaer.) Mass.)<br />
are still included in Aspicilia by modern authors.<br />
Thallus crustose, uniform, indeterminate or determinate, more or less areolate, attached to<br />
the substrate by hyphae of the hypothallns or of the medulla, without rhizinae; heteromerous,<br />
ecorticate or corticate ; algae protococcoid. Apothecia immersed in the thallus ; parathecium<br />
present, sometimes fuscescent but not carbonaceous ; hypothecium hyaline ; asci normally 8-spored ;<br />
ascospores hyaline, unicellular, ellipsoidal, relatively thin-walled, without a sheath. Spermatia<br />
exobasidial, bacilliform, cylindric or filiform, straight or curved.<br />
In our species the thallus is determinate as in the section Orbiczdares of Magnusson, K. Svenska.<br />
Vetensk. Akad. Handl. 111, 17, 5, 7; 1939.<br />
Parathecium about 35/* thick on the sides, thinning to 1 0 below ~ the hypothecium, hyaline ; theEium<br />
35~ tall . . . . . . . . . . . . . . I .. A. lygomma<br />
Parathecinm thin on the sides, 7 5 or ~ more, thick below, somewhat brownish<br />
Thecium 35 (-55)~ tall ; cortex 45-4OP thick ; spermatia 6-8 X lp . .<br />
Thecium 75-9OP tall ; cortex 60-75/* thick<br />
A. endochlora<br />
Parathecium obconic, usually reaching the base of the thallus; apothecial margin not<br />
elevated ; spermatia 16-20 X lp . . . . .. _ . . A. dkjunguenda<br />
Parathecium lenticular, resting on the algal layer ; margin of apothecia slightly elevated ;<br />
spermatia 9-11 X lp . . . . . . . . Lecalnma atrocaesia<br />
ASPICILIA LYWMMA (Nyl.) Dodge, comb. nov.<br />
Lecideo lygomma Nyl. ap. Crombie, Jour. Bot. Brit. For., 13, 334 ; 1875 : Jour. Linn. Soc. Bot., 15,<br />
189 ; 1877 : Phil. Trans. Roy Soc. [London], 168, 51 ; 1879 : Rept. Sci. Results Voy. " Chal-<br />
lenger" Bot., 1, 2, 238 ; 1885 : Wilson, MBm. Herb. Boissier 18, 88 ; 1900 ; Zahlbr., Deutsche<br />
Siidpolar Exp., 8, 35; 1906.
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