of the Herbarium of Acharius. 821 



The var. fi. syhatica is a good variety, or perhaps even a dis- 

 tinct species ; but the var. alpestris must not be separated from 

 it. This form is by no means alpine, but merely that of most 

 individuals which grow isolated instead of in crowded tufts. 



The var. 8. pungens, marked in the Acharian herbarium rangi- 

 cornis, belongs to C. furcata ; and it is astonishing that Acharius 

 did not recognize its affinity to this latter species. 



As to the var. pumila, it is nothing more than a small form of 

 C. rangiferina sylvatica. 



Besides these varieties described in the Synopsis, I have found 

 also in the Acharian herbarium an old specimen of C rangi- 

 ferina sylvatica, deformed and glomeruliferous, marked by 

 Schserer C. rangiferina, var. deformis, and a form of C rangi- 

 ferina with short erect branches widened and united at the 

 summit, ticketed by Acharius var. incrassata. I have frequently 

 met with this form in the fir-woods of Sweden and Finland; 

 but it is not sufficiently notable to be distinguished from the 

 type. Acharius has confounded, in his herbarium, some of Cla- 

 donia pungens, Flk., with this latter form. 



Lastly, the herbarium at Helsingfors contains also a beautiful 

 tuft of C. portentosa (Duf.), which Acharius must have received 

 after the publication of his Synopsis, for otherwise he would not 

 have failed to notice this remarkable form. 



41. Cenomycel vermicularis, (Ach.) Syn. p. 378 et hb. ejusd. 



The Acharian specimens were obtained from Lapland, Siberia, 

 Germany, and Switzerland. 



The var. taurica, in my opinion, does not deserve to be pre- 

 served distinct, since it is merely a swollen form of the type. 



Acharius has proved his sagacity by placing this plant doubt- 

 fully among the Cladonia; it constitutes at the present day the 

 type of the genus Thamnolia, of the tribe Siphulei, Nyl. 



42. Cenomyce? ceratites, (Ach.) Syn. p. 279 et hb. ejusd. 



The Acharian specimen was gathered in Lapland. 



This species, which Acharius has wisely placed provisionally 

 among the Cladonia, is the sole European representative of the 

 genus Siphula, Fr. 



Lastly, on the last sheet of the Cladoniacese of the Acharian 

 herbarium, we see pellmell many specimens of C degenerans 

 and of C. pungens, Flk., which the learned lichenographer pro- 

 bably did not know what to make of, and which bear, with a 

 sign of doubt, the names of C. rangiferina, var. incrassata, C. 

 crispata, C. gonorega, and C. ecmocyna, var. exoncera. 



