8 BERNT LYNGE. M.-N. Kl. 



It is well known that the nomenclature of the Physciaceae is very 

 intricate. Many questions cannot be settled without a study of the authen- 

 tic specimens, and owing to the present unsafe communications it was 

 impossible to obtain an inspection of more than a few of them. — The 

 more thanks are due to Prof. Elfving and to Dr. Wainio, Helsingfors, 

 who risked some of their specimens. — But to a great extent I was 

 obliged to confine my task to describing the species and varieties of the 

 available material and to rendering an account of their distribution and 

 biology. 



The geographical names will be found on Mr. Nissen's excellent maps 

 of Norway ^ (with Index of Names). 



Genera. 



Thallus with an upper pseudocortex, consisting of hyphae which are 

 parallel to the surface. I. Anaptychia. 



Thallus with an upper cortex, consisting of hyphae, perpendicular to 

 the surface. II. Physcia. 



This family also comprises a third genus, Pyxine, with lecideine apo- 

 thecia, distributed in exotic countries, and in North America. 



I. Anaptychia Kbr. 



Anaptychia Koerber Systema Lichenum. (1855) p. 49. Zahlbruckner 

 Lichenes (Flechten) B. Specieller Teil, in Engler u. Prantl Die natürlichen 

 Pflanzenfam. I i* (1907) p. 236. 



Syn. Borrera Ach., Hagenia Eschw., Physcia * Anaptyxhia Th 

 Fr., Psemiophyscia Müll. Arg. 



Thallus (in our species) large, laciniae multifid, elongate, upper 

 pseudocortex formed ofdensely interlaced hyphae, which are 

 parallel to the surface, lower pseudocortex of the same texture, well 

 developed at the margin of the laciniae, less developed or wanting at the 

 middle. Gonidia (according to Zahlbruckner 1. c.) Protococcus. 



1 Oberst Nissen's Karl over det sj'dlige Norge (i : 600 ooo, 4 parts), and his »Kart over 

 det nordlige Norge« (1:1 000 000). 



