6o BERNT LYNGE. M.-N. Kl. 



var. isidiata, Lynge nov. var. 



Thallus dense isidiatus. Praeterea ut in typo. 



Prope villam urbicam Ulstad par. Lom Norvegiae centralis. Supra 

 muscos in latere rupium, ca. 430 m. s. m. (Lynge). 



The isidia are short, papillose or with one initial branching. Colour 

 deep brown or brownish-violet, thallus covered with a bluish-violet pruina. 

 Laciniae short and broad, appressed to the substratum. The thallus is 

 thinner than usually in Ph. muscigena, but the anatomy is the same. The 

 isidia are clad with a thin (9 — ii/< thick) cortex, built up of more closely 

 interlaced hyphae than the normal cortex. Lower side black. 



The specimen was sterile. Pycnides could not be detected, which is, 

 however, frequently the case with isidiose lichens. 



The presence or absence of soredia is in my opinion a mark of impor- 

 tance, which will generally give title to a specific rank. I have here only 

 given it the rank of a variety, because the general appearance (habitus) 

 and the anatomy in nearl}- every other respect were those of Ph. musci- 

 gena. I do not know of any two species (petites espèces) differing only 

 in one character. A close investigation will always reveal not one or 

 two but quite a series of distinguishing marks, as is the case with the 

 »petites espèces« of the Parmelia o/ivacea-group. 



I can also remember having seen this variety in Karesuando, the 

 most northern parish of Sweden. 



8. Physcici constipata, (Nyl.) Norrl. et Nyl. 



Physcia pulverulenta <) tenuis (Kbr.) Th. Fries Lieh. Scand. I (187 1) 



P- 137- 



Physcia imiscigena var. constipata Nylander in sched. Norrlin Be- 

 rättelse i anledning af en till Torneå Lappmark verkställd naturalhistorisk 

 resa. Not. Sällsk. pro Fauna et Flora Fenn. Förh. vol. XIII (1873) p. 326. 



Physcia nlothrix * siibciliaris Nylander in Norrlin Flora Kareliae 

 Onegensis II (Lichenes). Meddel. Soc. Fauna et Flora Fennica I 

 (1876) p. 20. 



Physcia obscura* constipata Wainio Adjumenta I (1881) p. 134. 



Physcia constipata Olivier Lichens d'Europe I (1907) p. 244 (168). 



