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D.A.N.Z. ANTARCTIC RESEARCII EXPEDITION<br />
Thallus white to grey ; dscospores 10-13 X 5.5-7p . . . . B. grisea<br />
Thallus Eome shade of yellow<br />
Tops of areoles flat with black margins; apothecia up to 1 mm.<br />
in diameter; assimilative areoles 1 -52 mm. in diameter, 500p<br />
thick . . . . . . . . . . . . B. jlavoplana<br />
Tops of areoles convex, margins not black<br />
Apothecia usually white margined from dead cortical cells;<br />
hypothallus with occasional confervoid ttrands extending<br />
beyond the otherwise even margin<br />
Apothecia 0.4 mm.; assimilative areoles 1-5 mm. in dia-<br />
meter, 500-1,000p tall . . . . . . B. sz~perba<br />
Apothecia up to 1 mm. ; areoles 2-3 mm., 250p tall<br />
B. tristis<br />
Apothecia up to 1.5 mm.; areoles 3 mm., 1,500p tall<br />
B. variabilis<br />
Apothecia not white margined; hypothallns without confer-<br />
void strands<br />
Apothecia 0.2-0.5 mm. ; areoles 0-3-0-6 mm., 25M50p<br />
tall; ascospores 14-18 (-20) X 7-10:~ B. moctcwtula<br />
Apothecia 0.8 mm.; areoles 0.75 mm. broad; ascospores<br />
10-12 X 5-57p . . . . . . . . B. chrysea<br />
hIargin of hypothallus confervoid, or at least fimbriate<br />
Assimilative areoles subpedicellate, 3 4 mm. tall, pale rufous; ascospores<br />
22-30 X 0-12p . . . . . . . . . . B. stdpedkel!ata<br />
Assimilative areoles not pedicellate, much shorter<br />
Ascospore; 17-20 (-25) X 6.5-8 (-9)p; assimilative aeroles pale to<br />
dark isabelline, 600-1,000p thick . . . . . . B. irabdlinu<br />
Ascospores 16-23 X 10-14p; assimilative areoles dark rufous, 400-<br />
500p thick . . . . . . . . . . B. melanostola<br />
Ascospores under 18p (rarely up to 20p) long<br />
Apothecia wholly immersed, parathecinm not developed ; thallus<br />
olive brown ; ascospores 9-9.5 X 5 - 5-6 - 5~ . . B. brunnescens<br />
Apothecia nut immersed at maturity; parathecium well deve,<br />
loped (except in B. delulritica)<br />
Hypothecinm hyaline or very pale brownish<br />
Thallns some shade of brown<br />
Apothecia 0-25 mm. in diameter, white margined<br />
from old cortex; ascospores 12-14 X 8-lop<br />
B. pycrcogonuides<br />
Apothecia 0.3-0-33 mm., sometimes faintly white<br />
margined; ascospores 8-10 (-13) X 4-6<br />
(-7~5)~<br />
Thecium llOp thick, asci 30-8p; basal layer<br />
of areoles dark, 200,~ thick, parathecinnl<br />
4OP . . . . . . . . B. McLeani<br />
Thecium 50-60p, asci 35-53 X 13-18p; basal<br />
layer 10-15p thick, parathecium 15p on<br />
sides . . . . . . . . B. dendritka
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