168 LICHENOLOGICAL MEMORABILIA. 



that there are really well marked and characteristic features by 

 ■which it and its allies may be clearly distinguished and recognised. 

 This renewed examination also proves that P. malacea is more 

 generally distributed, and occurs fi'equently in Shropshire and 

 North Wales, whilst F. rufescens is comparatively much rarer. 



The following revised characters may be therefore useful : — 



Peltigera canina (L.), upper surface of thallus appresso-tomen- 

 tellose ; under surface longitudinally appresso-albo-tomentose, with 

 prominent pale anastomosing viUoso-tomenlose nerves extending to the 

 very margin, and clothed with tufts of pale rhizince ; mai'giu of apo- 

 thecium entire ; back of receptacle tomentose, almost subfurfuraceous. 



Fig.— Dill. t. 27, fig. 102 e. 



Exs. — M. & N. 154. Welw. 15. Scha^r. 28. Hepp. 575. 

 Richardson 84. Anzi It. Sup., 91. Maudon 18. Bohl. 30. 

 Reich. & Schub. 114. Wagn. 19. Mudd 59. Leight. 141. 



The localities in my Lich. Fl., 2nd ed., p. 108 may be taken as 

 correct. 



Peltigera malacea, AcH., upper surface of thallus smooth, but 

 minutely punctato-tomentellose upwards immediately below the 

 ajyothecia ; under surface tomentose, with bi-oad, flattened, confluent, 

 brown, tomentose spongiose nerves terminating below the paler-brown 

 uniformly tomentose margin, densely nigricanti- spongiose toivards the 

 centre and base ; margin of apothecium crenato-incised, connivent or 

 incurved; back of receptacle coarsely furfuraceous. 



Fig.— Sturm, D. Fl. t. 17. 



Exs.— M. & N. 1048. Zw. 223. Anzi Ital. Sup. 89. Rabh. 

 765. Reich. & Schub. 116. Hepp. 50. Ldght. 361. 



England. — High Rock, near Bridgnorth ! Sharpstones Hill ! 

 Craigforda ! all in Shropshire. 



Wales. — BenarthI near Conway; between Corwen and Bala ! 

 Craig Breidden ! 



The sterile thallus is almost invariably quite smooth on the upper 

 surface. 



Peltigera rufescens (Hffm.). Upper surface of thallus smooth; 

 under surface floccose, or reticulato-tomentose, with prominent dark 

 nigro-fuscous nerves, terminating in appressed flattened confluent pale- 

 brown smaller nerves at the margin, and bearing scattered tufts of 

 dark rhizince toivards the centre ; margin of apothecium crenulate ; 

 back of receptacle verrucoso-furfuraceous. 



Fig.— Dill. t. 27., fig. 103. 



Exs. — Reich. & Schub. 115. Spruce 57. Richardson 85. 

 Mudd 60. 



England. — Near Easby ! Cleveland, Mr. Mudd. 



Immediately below the apothecia the thallus is slightly longi- 

 tudinally plicate or plicato- rugose, but doubtful if constant. 



P. rufescens, Fellm. Lapp. Or. 69, having upper surface of 

 thallus granulose elevato-punctate, is no doubt = P . pidverulenta. 

 Tayl. in " Hook. Journ. Bot.," 1847, p. 184. 



