1 91 6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 97 



Loc. Recorded only from chalky substratum near the shore in Nor- 

 thern Norway : Ibbestad and Malangen : Nordbyneset in Tromse amt (Lynge), 

 Tromso (Lynge). 



According to Wainio (1. c.) /-'//. caesia ß teretiusaila Ach. »composita 

 est e Ph. tribacia (K ±) et e forma insigni forsan Ph. caesiac, reactione 

 K 1 at habitu Ph. teneUae et laciniis apice pulverulentis, . . . forsan haec forma 

 est autonoma species". This note, combined with the description, given 

 by AcHARiLS (1. c), leaves no doubt that our plant is identical with the * 

 latter of the two forms, mentioned by Waimo. It cannot be referred to 

 Pli. caesia, differing from that species by the narrow elongate laciniae, the 

 colour, and the structure of the soredia. Some specimens resemble a nar- 

 rowly laciniate Ph. tctiella or Ph. tnbacia, from which it is well separated 

 by the positive reaction of the medulla. It seems to me that its nearest 

 relation is with Ph. intermedia ; it agrees in some respects with young 

 states of that species, but differs in the purely ash-grey or white (never 

 brownish) colour, the very narrow, filiform discrete laciniae, and the small 

 and inconspicuous soredia ; Ph. intermedia is usually well fertile. Wainio 

 supposed it to be a proper species, and I agree with him on this question. 

 It is no advantage to descriptive botany to unite plants, which can be 

 kept apart. 



Harmand and Boistel state (1. c.) that the var. teretiusai/a or suhteres 

 has the reaction : K ± . It is therefore probably not identical with our 

 plant. In our copy of the collection Claud, et Harm. 319 is worm-eaten 

 and the remains insufficient for comparison. 



18. Physcia intermedia Wain. 



Physcia intennedia Wain. Lieh. \'ib. p. 51. Meddel. Soc. pro Fauna et 

 Flora fennica vol. II 11878). Olivier Lieh. Eur. I (1907I p. [163] 239. 



Thallus middle-sized and orbicular or large, diftbrm, up to 10 — 15 cm. large, 

 very fragile. Laciniae stellate, discrete— subcontiguous or closely contiguous — 

 imbricate; they are slight! 3' convex, linear, frequently with crenate margins, 

 narrow, 0,2 — 0,5 ^^- broad, closely appressed, or free from the substratum 

 at their apices. Thallus not isidiate, but sprinkled with low, depress o- 

 globose or even crateriform soredia, formed on the surface of the 

 thallus, and at the apices of the short lateral branches, more rarely at the 

 circumference of the thallus. They are sometimes quite confluent, covering 

 the whole thallus, or leaving only a few free laciniae along the circum- 

 ference. Thallus opaque, albo-maculate, but not always distinctly, epruinose 

 Vid-ijelsk. Skrifter. I. M -N Kl. 1916. No. 8. 7 



