314 L^Abbe E. Coemans on the Cladonise 



from Central France, and one of C. cenotea, from the Pyrenees, 

 are marked, by the hand of Acharius, Cen. gonorega virgata, 

 and Cen. gonorega vetusta. C. squamosa is also intermingled 

 with the forms scabrosa and gracilescens. Lastly, three speci- 

 mens, branched and tortuous, of C. furcata are ticketed Ceno- 

 myce gonorega'i var. palmacea', and a small specimen of C. 

 amaurocrea from Switzerland is also marked Cen. gonorega. It 

 is very difficult to understand how the learned lichenographer 

 could possibly have united all these species with C. degenerans. 



14. Cladonia peltasta, (Ach.) Syn. p. 261 et hb. ejusd. 



The Acharian herbarium contains only one specimen of this 

 rare species, gathered in the Isle of Bourbon and received from 

 Bridel. The specimen has been partially removed, but sufficient 

 still remains to recognize the characters of the species. 



Acharius has erred in placing this Lichen amongst the sey- 

 phiferous lichens : its proper position is near to C. rangiferina. 



15. Cladonia ecmocyna, (Ach.) Syn. p. 261 et hb. ejusd. 



This species is now more generally known as Cladonia gracilis. 



As in other species, so here also, many of the Acharian varie- 

 ties are of too little importance to be retained : e. g. amaura, 

 floripara, leucochlora, valida, elongata, and exoncera. 



The var. corymbosa, Ach. (Syn. p. 263), does not belong to 

 C. gracilis, but to C. furcata, as Dr. Nylander has already re- 

 marked, and as the Acharian herbarium confirms. 



Making the var. hybrida (Ach.) the type of the species, four 

 forms or principal varieties may be distinguished, viz. : — 



The form chordalis {gracilis, Ach.) for plants which are slen- 

 der, subuliform, or with narrow scyphi. 



The form macroceras, to characterize those robust and gigantic 

 forms which attain, in arctic or alpine localities, to 25 centims. 

 in length. 



The form aspera, to designate folioliferous specimens with 

 crisped, lacerated scyphi, and which remind us, by their general 

 appearance, of the var. trachyna of C. degenerans. 



Lastly, the form cornuta, to indicate those forms which have 

 the upper portions of the stems sub pulverulent, and which have 

 heretofore constituted a separate species under the name of 

 Cladonia cornuta, Fr. 



The incorrect determinations observable in the Acharian 

 herbarium are as follows : — 



1. Under the name of C. ecmocyna a. gracilis are found some 

 specimens of C. furcata, var. surrecta, Flk. (from France), and 

 three others of C. pyxidata cornuta (from Switzerland) . 



