60 BERNT LYNGE. M.-N. Kl. 



var. isidisitsi LYNGE nov. var. 



Thallus dense isidiatus. Praeterea ut in typo. 



Prope villam urbicam Ulstad par. Lorn Norvegiae central is. 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 n /.i 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 nearly every other respect were those of Ph. musci- 

 gena. I do not know of any two species (petites especes) 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 especes of the Parmelia olivacea- group. 



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

 most northern parish of Sweden. 



8. Physcia constipata (NYL.) NORRL. et NYL. 



Physcia pulverulenta d tennis (KBR.) TH. FRIES Lich. Scand. I (1871) 



P- 137- 



Physcia muscigena var. constipata NYLANDER in sched. NORRLIN Be- 

 rattelse i anledning af en till Tornea Lappmark verkstalld naturalhistorisk 

 resa. Not. Sallsk. pro Fauna et Flora Fenn. Forh. vol. XIII (1873) p. 326. 



Physcia ulothrix * subciliaris 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). 



