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101 B.A.N.Z. ANTARCTIC HESEAItCII EXl'EDITlON<br />
Type : Liclten sclnguinarius L. for all names.<br />
Thallus crustose, uniform, ecorticate, with protococcoid algae. Apothecia sessile; para-<br />
thecium very thick, highly gelified, often darkened bllt not truly carbonaceous ; hypothecium hya-<br />
line or reddish, paraphyses slender, branched, suggesting Pertusario but more compact, gelified ;<br />
asci 1-8-spored; ascospores ellipsoid, large, hyaline, with a thick, gelified wall resembling those<br />
of Pertzcsuria much more than those of the Lecideaceae.<br />
The 6-spored members of the gelins are subantarctic, reaching New Zealand, but have not<br />
yet been detected in the western hemisphere; the 2-spored members esteiid from New Zealand<br />
iiortli\varcl to the Philippines, Siberia and Central Europe, while the I-spored species are sub-<br />
arctic aiid alpine in both hemisplieres. The characters of the thecium are suggestive of Pertu-<br />
sariaceae, especially Pertssaria sect. Lecanorastrzcnt, and perhaps should be included in that family<br />
rather than i11 the Lecideaceae, where they have !~een universally placed.<br />
Asci 8-spored ; ICerguelcn<br />
Ascospores 24-36 X 11-18p . . . . . . . . . . 1T1. perustus<br />
Ascospores 38-51 X 21-34p . . . . . . . . . . M. stepha?todes<br />
Asci 1-2-spored ; ascospores 40-50 ;< 24-28p ; thallus sorediate ; Campbcll and Macquarie Islands<br />
M. cantpbell~ianus<br />
MYKOBLASTUS PEKUSTUS (Nyl. i11 Crombie) Dodge, comb. nov.<br />
Lccidea fziscoatva Hook. f. & Tayl. Cryptog. Antarct., 233; 1845 : F1. Antarct., 2, 539; 1847 non<br />
Ach. '<br />
Lecidea perusta Nyl. in Crombie, Jour. Bot. Brit. For., 13, 334 ; 1875 : 15, 106 ; 1.877 ; Jour. Linn.<br />
Soc. Bot., 15, 188; 1.876 : Phil. Trans. Roy. Sot. [London], 168, 51 ; 1879 : Rept. Sci. Results<br />
Voy. " Challenger' ' Bot. 1, 2, 238 ; 1885.<br />
Type : Kerguelen, Observatory Ray, A. E. Eaton (Venus Transit Exp.).<br />
Thallus relatively thick, somewhat determinate on a black hypothallus which extends a short<br />
clietance beyond the thallus, giving alr inconspicuous black margin, olive buff, rimose to'rimulosenreolate,<br />
the centres of the areoles slightly convex ; ecorticate, highly gelified ; algae protococcoid,<br />
cells aboul 4-5,~ in diameter, with short filaments of a brownish Scytonema penetrating the thallus<br />
for eome distance.<br />
Apothecia, black, solitary, crowded or coalesced (then giving the appearance of Glypltis) up<br />
to 2-5 mm. in diameter, angular and irregular by mutual pressure, margins thick, prominent, disc<br />
concave to plane, black; semi-immersed in the thallus; parathecium gelified, of thick-walled<br />
brownish moniliform branching hyphae more or less perpendicular to the surface (thick sections<br />
may appear carbonaceous but not truly so) about 9 0 thick ~ at the margin, becoming llOp thick<br />
below the hypothecium where the hyphae are lighter and densely interwoven; hypothecium thin,<br />
35p thick, of slender densely woven deeply staining hyphae; thecium 140-150~ tall; paraphyses<br />
slender, appareMi
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