I92I. No. 7. STUDIES OX THE LICHEN FLORA OF NORWAY. I25 



Soii?'. Knutsho (B. L.). 



Nord I. Rode: Holand (Norm.), Saltdalen (Somrft.). Troiiis. Maals- 

 elven: Maalsnes (B. L.), Bardo: Stromsmo (B. L.I, Tromsø (Norm.), Lyngs- 

 eidet (B. L.). 



Pcltigcra practcxtata is most probably distributed throughout our whole 

 countr}'. It is much more common than Pcltigcra lepidophora. It ascends 

 far beyond the tree line, but on the whole it is of a less alpine type than 

 the latter species. It approaches \-er3' much to Pcltigcra rufesccns. 



Apothecia rara, suborbicularia, diam. 6 — 14 mm., discus badius, eprui- 

 nosus, revolutus, margine tenuis, dein evanescens. Hymenium superne 

 flavofuscescens, strato amorpho incolorato tectum, 80 — 90 [x altum. Para- 

 ph3'ses indivisae vel rarius furcatae, apice clavato-incrassatae, septatae. Sporae 

 uni- triseptatae, rectae vel subrectae, 40 — 50 (6o)><4 — 5 |i.. 



On gravel, mossy road-sides &c., also at the base of mossy stems. 



The short spores might indicate a specific difference between this 

 species and P. rufcsccus. Crombie gives the dimensions of the spores of the 

 latter species at 42 — 72x4 — 5 (Brit. Lieh. I p. 288). 



An examination of the spores of P. rufesccns from Northern Norway 

 showed that 3-septate spores 40 — 50 \i. long, were by far the most com- 

 mon ones, it was a rare thing to find 5-septate larger spores. Plants from 

 Southern Norway also had 3-septate spores of the same length as the most 

 frequent ones, but 5 — 7 -septatae, larger spores up to 80 [i. were present 

 in varying numbers, and sometimes dominant. 



The specific difference between P. rufesccns and P. practcxtata must, 

 accordingly, be founded on other characters than the spores. 



The short, 3-septate spores might indicate a climatic reduction. In 

 good accordance with this view Th. Fries fixes the spore dimensions of 

 P. canina (rufcsccnsl) at 42 — 48x4 in his Lieh. Arct. p. 44, but he descri- 

 bes them as 'pleioblastae'. — On the other hand there is no reduction 

 in the thallus itself of specimens from Northern .Norway. The squamules 

 are somedmes poorlv developed, and the specific difference may then be 

 doubtful. 



6. Peltigera lepidophora (Nyl.) Wain. 

 Du RiETz Lieh. Fragm. Svensk Bot. Tidsskr. 19 15 p. 421. 



Akcrsh. Nordmarken: Blankvandsbraaten (B. L.). 



Honl. Granvin: Torrhedler (H.), Skaalsæte (H.), and Gauphedler (H.), 

 Finse: Kirkesdornuten (B. L.). 



Hcd. Tonset: Havern (B. L.). 

 Sortr. Dovre: Drivstucn (B. L.I. 



