104 Dr. W. Nylander on new British Lichens. 



0003 tnillitn. (rarius simul subbacillares et longitudinis usque 

 ' 0014 millim.) ; paraphyses gracilescentes vel non bene dis- 

 - cretse; epithecium, hymeuium et hypothecium incoloria. 



Gelatina hymenea iodo cserulescens, deinde mox violacee 



tincta vel violaceo obscurata. 



Ad cortieem ulmi prope Clifton in Anglia, 1865. (C. Lar- 

 balestier, Esq.) 



Facie est Lecidece luteola, var. chlorotica, Ach., sed affinitate 

 accedit ad L. glohulosam, Elk. 



2. Verrucaria antecellens, Nyl. 



Similis V. epidermidis f. tremulce, sed sporis (ovoideo-oblongis, 

 l-septatis) multo majoiibus, longit. 0-032-0-035 millim., 

 crassit. 0009-0"011 millim.; paraphyses graciles vel vix 

 ullse. 

 Ad cortieem 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. myriocarpoides, Nyl. in litt. ad Tuck ; hoc corri- 

 gere liceat ex examine accuratiore. L. myriocarpoides tha- 

 lamium habet dilute lutescens et epithecium luteo-fuscescens; 

 in dicta L. expansa thalamium est subincolor, epithecium 

 nigricans; etiam thalli et hypothecii differentiae obveniunt, 

 Ob nomen expansa alii ante datum a Chevalier mutandum, 

 proponere liceat ejus loco novum. Dicatur turn nostra ex- 

 pansa posthac Lecidea dispansa. Male ad banc dispansam 

 relata fuit L. sylvicola, Flot. Krbr. Lich. Sel. 75, cui apothecia 

 vulgo convexa, thalamium (lamina tenui visum) cserulescens, 

 epithecium non obscuratum, hypothecium medio nigricans, 

 gelatina hymenea iodo vinose rubens, spermatia tenuiora, etc.; 

 ita differentiae plurimse. 



On the Cephalodia in Peltidea venosa. By Dr. W. Nylander. 

 (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 panaola, placodioid ones in Placopsis, fruticulose ones 

 in certain Stictei, besides others in Stereocaulon, Usnea, &c. 



On the lower surface of the thallus peculiar pyreuodine {" ob 

 formam imitautem apothecia pyrenocarpea obtecta'^) cephalodia 

 are present in some Stictei and in Nephroma expallidum. 



