104 Dr. W. Nylander on new British Lichens. 
0:003 millim. (rarius simul subbacillares et longitudinis usque 
0014 millim.) ; paraphyses gracilescentes vel non bene dis- 
crete; epithecium, hymenium et hypothecium incoloria. 
Gelatina hymenea iodo cerulescens, deinde mox violacee 
tincta vel violaceo obscurata. 
Ad corticem ulmi prope Clifton in Anglia, 1865. (C. Lar- 
balestier, Esq.) 
Facie est Lecidee luteole, var. chlorotice, Ach., sed affinitate 
accedit ad L. globulosam, Fik. 
2. Verrucaria antecellens, Nyl. 
Similis V. epidermidis f. tremule, sed sporis (ovoideo-oblongis, 
l-septatis) multo majoribus, longit. 0-032-0°035 millim., 
crassit. 0-009-0:011 millim.; paraphyses graciles vel vix 
ulle. 
Ad corticem Ilicis in Anglia (Tilgate Forest, Sussex) legit 
Larbalestier. 
Varietas sit V. epidermidis. Apothecia conferta, sat parva. 
3. Lecidea dispansa, Nyl. 
Lecidea expansa, Nyl. in Leight. L. Br. Exs. 186, memorata in 
‘Flora’ 1865, p. 355, non omnino eadem est ac Americana 
corticola L. my iyriocarpoides, Nyl. in litt. ad Tuck; hoe corri- 
gere liceat ex examine accuratiore. L. myriocarpoides tha- 
lamium habet dilute lutescens et epithecium luteo-fuscescens ; 
in dicta Z. expansa thalamium est subincolor, epithecium 
nigricans; etiam thalli et hypothecu differentize obveniunt. 
Ob nomen expansa ali ante datum a Chevalier mutandum, 
proponere liceat ejus loco novum. Dicatur tum nostra ex- 
pansa posthac Lecidea dispansa. Male. ad hane dispansam 
relata fuit L. sylvicola, Flot. Krbr. Lich. Sel. 75, cui apothecia 
vulgo convexa, thalamium (lamina tenui visum) cerulescens, 
epithecium non obscuratum, hypothecium medio nigricans, 
gelatina hymenea iodo vinose rubens, spermatia tenuiora, etc.; 
fa differentize plurimee. 
On the Cephalodia in Peltidea venosa. By Dr. W. NyLanpEr. 
(Flora, 1866, p. 116.) 
Dr. Nylander has at various times in his writings pointed out 
the existence of cephalodia of divers sorts upon Lichens. On 
the upperside of the thallus granuliform cephalodia occur in 
Lecidea paneola, placodioid ones in Placopsis, fruticulose ones 
in certain Stictei, besides others in Stereocaulon, Usnea, &c. 
On the lower surface of the thallus peculiar pyrenodine (“ ob 
formam imitantem apothecia pyrenocarpea obtecta”) cephalodia 
are present in some Sfzctei and in Nephroma expallidum. 
