482 Dr. W. Nylander on new British Lichens. 
LVII.—Notule Lichenologice. No. XXII. 
By the Rev. W. A. Lerauton, B.A., F.L.S. 
In the ‘ Flora,’ May 6, 1868, Dr. Wm. N Nadas publishes 
the following additions to our British Lichens :— 
1. Calicium diploéllum, Nyl. 
Thallus vix ullus proprius; apothecia nigra, brevissime stipi- 
tata, capitulo turbinato (crassit. 0°05-0°07 millim., in humido 
statu duplo crassiore), aperto, massa sporali vix prominula ; 
spore nigrescentes, oblongz, simplices, longit. 0°006-0- 009 
_ millim., crassit. 0-003, deinde (in massa sporali) 1-septate 
et nonnihil crassiores (crassit. 0°0045 millim.). 
In Hibernia, Killarney, ad corticem ilicis (Carroll). 
Species omnium minutissima et facillime dignota. Prope 
C. disseminatum locum habet.. 
2. Calicium retinens, Nyl. 
Thallus albus, opacus, tenuis, subfarinaceus, effusus (an pro- 
prius?); apothecia nigra, minuta (crassit. 0°10-0°25 mil- 
lim.), sessilia, lecideiformia, massa sporali non distincta ; 
spore nigrescentes, oblonge vel oblongo-cylindrice, con- 
spicue 1-septate, longit. 0°008-0:011 millim., crassit. 
0:0025-0°0035 millim. : hypothecium rubricoso-fuscescens. 
In insula Caesarea (J ate ad corticem quercus (Larba- 
lestier). 
3. Lecanora holophea, var. glaucopsora, Nyl. 
Thallus squamuloso-crenatus vel squamulis totis granulatis 
(vel passim subleprosis) ; apothecia livido-fusca, mediocria 
(latit. 1 millim. vel minora), margine thallino subintegro 
cincta; spore 8, incolores, fusiformes, 1-septate, longit. 
0-012-0-018 millim. : crassit. 0°003-0-004 millim. ; ; para- 
physes gracilescentes, apice clavato fuscescente. Todo gela- 
tina hymenea czerulescens. 
In insula Ceesarea (Larbalestier), 
Spermatia longit. 0°003 millim., crassit. 0-001 millim., 
arthrosterigmatibus infixa. 
4. Lecidea arceutina, var. hypnea, Ny]l. 
Thallus albidus vel albo-cinerascens, tenuissimus; apothecia 
fusca vel nigricantia, demum convexa (latit. 0° 5 millim. )3 
spore longit. 0°045-0°070 millim. Jodo gelatina hymenea 
ceerulescens. 
Supra muscos in insula Ceesarea (Larbalestier). 
