of the Herharium of Acharius. 309 



6. Cladonia endivice folia, Fr. (Acli.) Syn. p. 250 et hb. ejusd. 



Two specimens of this species deserve to be cited here — one 

 from the isle of Aland, the most northern station known, and 

 the other from Tiflis, by the late Stevens, whose rich herbarium 

 is also in the museum of llelsingfors. The Acharian herbarium 

 comprises also some specimens from France, received from M. 

 Leon Dufour, and bearing this inscription: "Affinis Cen. con- 

 volutce, ast semper subtus cervino." Acharius has ticketed these 

 thus : " var. major Cen. endiviafolia." They are perfectly refer- 

 able to the \ar.firma of C. alcicornis (Nyl. Syn. p, 191). 



There is also a pretended variety of C. endiviafolia or of C. 

 alcicornis, concerning which we have no certain information — 

 the variety cladomorpha. In his first worlos Acliarius regarded 

 this as a variety of C. alcicornis ; afterwards, in his ' Synopsis ' 

 (p. 259), he attaches it to C. degenerans ; and lastly, in the Sup- 

 plement to that work (p. 342), he joins it to C. endiviafolia. 



The Acharian herbarium demonstrates undoubtedly that this 

 variety is only a form of C. degenerans, var. lepidota. For the 

 future, therefore, this variety must be suppressed. As to the 

 C. alcicornis, cladomoiyha (Ach.), Habenhorst, 'Cladoniaj Eu- 

 ropsejB,' tab. i. no. 5, it scarcely differs from the type of this 

 species. 



The C endiviafolia itself is not a good species, but forms only 

 a variety of C. alcicornis, as I have shown in my * Cladoniae 

 Belgicffi,' No. 7 (1863). 



7. Cladonia cervicornis, Schser., (Ach.) Syn. p. 251 et 

 hb. ejusd. 



This lichen is badly represented in the Acharian collection. 



The var. prodiga, Ach. L. U. pp. 531-532, is, according to 

 the fragments still in the Acharian herbarium, only a small, in- 

 significant proliferous form of the type. 



8. Cladonia verticillata, Flk., (Ach.) Syn. p. 251 et hb. ejusd. 



This species, or, more correctly, this perfect form of the pre- 

 ceding type, has, in the herbarium at llelsingfors, representative 

 specimens from the principal countries of Europe, and even from 

 North America. 



Florke did not separate the C. cervicornis from C. verticillata, 

 and that justly. Acharius himself did not always know how to 

 distinguish these two forms from each other, as is proved by 

 certain hesitating determinations in his herbarium and the con- 

 fusion of the two types in this collection. 



I regard, therefore, the C verticillata as the type of the 

 species, and the C. cervicornis as a simple macrophylline variety. 



