I9l6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 93 



var. dubia (HOFFM.?, ACH.) TH. FR. 



an Lobaria dubia HOFFM. Fl. Germ. (1795) p. 156 (not seen)? 



Lichen dubius. ACHARIUS Prodromus (1798) p. 123. 



Parmelia caesia var. dubia ACHARIUS Methodus (1803) p. 197. ACHA- 

 RIUS Lich. Univ. (1810) p. 479. 



Lichen caesius var. dubia WAHLENBERG Flora Lapponica (1812) p. 422. 



Physcia caesia var. dubia TH. FRIES Lich. Scand. I (1871) p. 141. 

 DALLA TORRE et SARNTHEIM Die Flechten von Tirol (1902) p. 164. 



I have seen neither an authentic plant from HOFFMANN, nor his de- 

 scription in Flora Germanica. If his plant is identical with ours we must 

 write the author: (HOFFM.) TH. FR.. If not, ACHARIUS is the oldest 

 author. It is evident from the description of ACHARIUS in Lich. Univ. - 

 where ACHARIUS Prodromus is cited as a synonym that his plant is 

 identical with ours. ACHARIUS Prodromus was edited in 1798, FLOERKE 

 Deutsche Flechten No. 72 in 1819. 



Exsic. ARNOLD Lich. Exsicc. 1724, FLOERKE Deutsche Flechten 72, 

 FUNCK Krypt. Gewachse 417, LEIGHTON Lich. Brit. 323, MALME Lich. Suec. 

 353 (intermediate between var. dubia and the type), SCHAER. Lich. Helv. 

 348 (according to ARNOLD Jura, absent in our copy). 



According to ARNOLD Jura p. 50 STENH. 212 sup. sin. belongs to 

 this variety, in our copy of the said collection No. 212 supr. is the typical 

 Ph. caesia. 



Thallus orbicular, middle-sized, diam. 2 5 cm., laciniae appressed or 

 slightly ascendent at the apices, narrow, discrete and stellate or broader, 

 contiguous, and indistinctly stellate. The apices of the laciniae (more 

 especially those of the secondary laciniae) dilated, recurved, and covered 

 with minute granular soredia, which may ultimately attain a coral- 

 loid, isidiate appearance. Surface minutely regulose and with whitish dots. 

 The colour varies from white to ashgrey, nearly colourless beneath, with 

 a few, darker fibrillae. 



Apothecia not frequent. Margin thin, crenulate, sometimes sorediate. 

 Paraphyses, spores and the other anatomical characters as in the type. 



Hab. The Norwegian specimens in our herb, are found on rocks, 

 usually near the water. (FLOERKE No. 72 from wood). 



Loc. It is usually associated with the type; it is not frequent, but 

 has a wide distribution: Southern Norway: Malmeen (MoE s. n. P. caesia p 

 albined), and Naeseen (LYNGE) near Kristiania, Lynger (LYNGE), Western : 

 Moster (HAVAAS and LYNGE), Sunde near Luksund (HAVAAS). Central: 



