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DODGE--<strong><strong>LICHEN</strong>S</strong> <strong>AND</strong> <strong>LICHEN</strong> <strong>PARASITES</strong> 246<br />
Thecium 100-12011 tall; parathecium 120p on sides, 180p thick below<br />
. . . . . . . . . . B. dichroma tivaa<br />
Thecium 50-55p tall; parathecium not well differentiated B. Russellii<br />
Cortex fastigiate but not capitate-fastigiate<br />
Ascospores 10-12 X 6-8p; thallus wholly black, 1-2 mm. thick; apothecia<br />
0.5 mm. in diameter . . . . . . . . . . B. pernigra<br />
Ascospores 13-20 (-22)p, long, paraphyses capitate<br />
Thallus dirty reddish, areoles 1-1-5 mm. in diameter, up to 1 mm.<br />
thick, apothecia 0.20.5 mm., thecium 140-160p tall, tips of paraphyses<br />
8-9p in diameter . . . . . . B. conspicuu<br />
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Thallus rufous, areo!es, 0.7-1.5 mm. in diameter, 400-60011 thick;<br />
apothecia 0.4-1 mm., thecium 130-140p tall, tips of paraphyses<br />
/'-<br />
5-6p - . . .. 1<br />
..<br />
. . . . . . . . B. russa<br />
Thallus white, ashy or pale rufous<br />
Cortex 5-10 (-20)p thick; apothecia 0-5-1 mm., areoles 0.5-1-5<br />
mm. in diameter, tips of paraphyses 6p . . B. imperfecta<br />
Cortex 15-30p thick<br />
Apothecia 0.5-1 mm.; areoles 0.2-0.5 (-1) mm., tips of<br />
paraphyses 7-8p . . . . . . . . B. melampoa<br />
Apothecia 0-4-0.5 mm. ; areoles 0-4-1 mm. ; tips of para-<br />
physes 4-6p . . . . . . . . . . B. Gainii<br />
Cortex capitate-fastigiate<br />
Thallus white to cream colour; thecium 40p tall, ascospores 8-9-5 X 4.5-<br />
6~ . . . . . . . . . . . . . . B. floccosa<br />
a Thallus ashy to rufescent ; thecium 12OP tall, ascospores 15-19 X 7-911<br />
B. polychru<br />
. Hypothallus white, extending beyond the assimilative areoles; ascospores 12-20 X<br />
6-lop<br />
Apothecia 0.5-1 -5p mm. in diameter ; thallus dirty ashy fuscous<br />
B. latemwginatu<br />
Apothecia 0.3-0.7 mm. in diameter; thallus white, rufescent toward the margin<br />
. . . . . . . . . . . . . . . . . . B. Lioz~villez<br />
Hgpothallus black, extending beyond the assimilative areoles<br />
Margin of hypothallus even, very rarely with a few confervoid strands extending<br />
beyond<br />
Ascospores (16-) 22-24 X 7-lop; thallus greenish white B. festivissima<br />
Ascospores 15-22 X 5.5-9p; thallusrufous . . R. acarosporvides<br />
Ascospores under 20p long<br />
Thallus black; ascospores 10-12 X 6-811 . . . . . . B. pernigra<br />
Thallus ashy fuscescent, K-; ascospores 11-17 X 7-911 B. brabantica<br />
Thallus brown, white punctate, K yellow, reddening; ascospores 12-<br />
16 X 5-6p . . . . . . . . . . - . . B;aaugusta<br />
Thallus. whitish ashy; ascospores 12-15 X 6-8;~ . . B. protothdlina<br />
~~otheci; elevated, plane to somewhat convex, margined<br />
v. Gerlaehei<br />
Apothecia immersed !n the thallus, finally only slightly elevated<br />
. . . . . . . . . . v. indissimi-lis<br />
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