ENDOCARPISCTJM. 113 



with much of the ambiguity of that of the Peltigerei. The spores 

 are commonly without colour, and appear on the whole well- 

 referable to the Colourless Series, the ultimate condition of 

 which is the acicular spore. But yet indications of colour are 

 sufficiently frequent to suggest that the organs we are consider- 

 ing are rather decolorate than colourless ; and Pannaria lys- 

 sina, which we cannot but regard as belonging here, offers us 

 finally the perfected (if still decolorate) muriform type of the 

 brown Spore-series. The Pannariei are conceivable then as 

 decolorate members of the Series characterized by muriform (typi- 

 cally coloured) spores, and as contiguous therefore with Umbili- 

 cariei, and to some extent at least, if not with the bulk of, Pelti- 

 gerei, on the one hand, as especially with Collemei on the other. 

 Genera, p. 61. 



XIX. ENDOCAKPISCUM, Nyl. 



Apothecia sunken commonly in the thallus and indicated 

 only by an ostiole, but becoming superficial and lecanorine. 

 Spores very minute, simple, without colour; numerous in 

 the thekes. Spermatia ovoid ; on sub-simple sterigtnas. 

 Thallus foliaceous, peltate, monophyllous ; free, and strongly 

 corticate beneath ; the hypotballus deficient. Gronimous 



layer consisting of gonimia. Montagne (PL Cell Canar. I. 



infra cit.) remarks "the considerable resemblance" both as 

 respects habit and colour, of Endocarpiscum Guepini to 

 Heppia Despreauxii. And Nylauder, more recently, goes 

 so far (Obs. Lick. Pyren. p. 56) as to say that "Endocarpis- 

 cum, properly considered, is Heppia, or scarcely a sub-genus 

 of it." But the two types may be said notwithstanding to 

 be well distinguished, no less by external habit than by 

 structure. 



1. E. Guepini (Delis.) Nyl. ; thallus small, monophyllous, 

 cartilagineous-coriaceous ; from greenish- becoming brownish- 

 olive, the repand, revolute edges gray-sorediate ; beneath naked 

 and smooth, wrinkled, from flesh-coloured at length tawny; 

 apothecia deeply sunken in minute pits [but becoming super- 

 ficial and lecanorine]. Spores very minute, and numerous in the 



thekes; rounded and oblong, simple, without colour. Endo- 



carpon, Fr. L. E. p. 410. Guepinella, Bagl. in Nuov. Giorn. 

 Sot. Ital 2, 171. 

 8 



