INTEODUCTION TO CRYPTOGAMIC BOTAUr. 



389 



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Xmioriej.— Excipulum carbonaceous ; aperture 

 irregular. 



Trypetheliei. — Excipula immersed in distinct pus- 

 tules ; nucleus deliquescent. 

 Verrucariei. — Excipula scattered, carbonaceous; 

 aperture punotiform ; thallus crus- 

 taceous. 



^JM^ocar^ei.— Excipulum simple or double, at length 

 ostiolate ; thallus horizontal. 



/^A«rqpAom.— Excipulum at length ruptured 

 above ; thallus vertical, fruticulose. 



Lichinei. — Gelatinous. 



Caliciei. — Disc at length pulverulent. 

 Glyphidei. — Disc irregular, coloured, at length ex- 

 posed, immersed in warts of the 

 thallus. 



Oraphidei. — Disc elongated, simple or branched, 

 with or without a proper exoipulum. 



Pyxinei.—DisQ orbicular ; excipulum adnate to the 

 horizontal foliaceoua thallus. 



Coccocarpei.— Disc rounded, without any excipulum. 



CoUemacei. — Thallus gelatinous. 



Lecidiiiei. — Disc naked from the beginning ; exoi- 

 pulum present ; thallus various. 



Parmdiacei. — Disc orbicular, surrounded by the 

 thallus. 



a. Pdtigeri. — Disc at first veiled, bordered by the 

 thallus ; thallus foliaceous. 



h. Ev,parmdiac.ei. — Disc at first closed, bordered by 

 the horizontal centrifugal thallus. 



c. Usneacei. — Disc at first naked ; thallus for the 

 most part vertical, without hypo- 

 thallus. 



I. Angiocaepei, Schrad. 



Apothecia closed, at length dispersing their sporidia by 

 means of an irregular fissure or minute ostiolum ; nucleus firm 

 or deliquescent. 



428. It is very doubtful, as said above, if any Lichens are 

 truly sporophorous in their most perfect state. There may be 

 sporiform fruit in addition to the sporidiiform ; and if the 

 bodies which occur occasionally on the tips of the asci be 



