206 lUCUNT LYNGK. M.-N. Kl. 



10. Cetraria nigricans Nvi.. 

 Map. XII, 2. 

 Troiiis. Alt(\an(l-I )i\i(lal(ii ll>. L.). J'iiiiii. Alten: Kautasvarrc (B. L.l; 

 Kaiitokcinii pi'. Higj.^'cjaxrc {\v<^.'-!]\ Kara.sjok-BD.sckop (B.\ri<), Karasjok : Jæg- 

 gcvarre (B. L.l; Borsanger: Laksch- (B. L.l; 'lana: Berlcvaag (B. L.). 



Not rare in subalpine and alpine positions in the inland districts of 

 Arctic Norway. More common in the adjacent parts of Northern Sweden; 

 a circumpolar species, recorded also from Siberia and North America. 



On large stones at the lower part of the incline of debris (Norw. 'ur'l, 

 where water at times is streaming below; ace. to Lh. Fries also on earth. 



Apothecia diam. 2 — 3 mm., lobis applanatis antice affixa vel dein 

 subterminalia, corona spinosa marginata. Discus convexiusculus, rufo- 

 fuscescens, nitidus; receptaculum spinosum. Cortex receptaculi (verus) 30 

 — 45 [jt. altum, parte exteriore dilute flavo-fuscescens, ceterum incoloratum, 

 hyphis perpendicularibus valde pachydermaticis, constricte septatis vel — 

 si brevibus — eseptatis, 10 — 14 \j. crassis, formatus; cortex infrahypothe- 

 cialis incoloratus, 30 — 50 [x altus, hyphis crassis, pachydermaticis, varie 

 directis, sed vulgo subpeVpendicularibus, formatus. Medulla angusta, hyphae 

 db adspersae, 3 — 5 \l crassae, ramosae. Tota medulla receptaculi gonidiis 

 dispersis vel + conglomeratis continens, etiam in spinis gonidia adsunt. 

 Hypothecium (verum) incoloratum, ca. 25 \j- altum, e hyphis sat tenuibus, vulgo 

 horizontalibus, formatum. Hymenium angustum, 65 — 75 \l altum, strato hN'alino 

 (5 — 6 [J.) tectum, superne flavo-fuscescens, ceterum incoloratum. Paraphyses 

 indivisae, septatae, apice leviter clavato- vel capitato-incrassatae. Asci octo- 

 spori, angusti, membrana apice mediocriter incrassata. Sporae (parce evo- 

 lutae), ellipsoideae, 9 — 10.5 [j. longae, 4.2 — 4.8 \l crassae. 



React. KOH -i-. Hymenium J e caeruleo mox sordide cinereo- 

 virescens, asci solum persistenter caerulescentes. Hypothecium (proprium) 

 et hyphae medulläres J persistenter caerulescentes. Medulla thallina 

 amylacea. 



I have never seen fertile Norwegian specimens. The above descrip- 

 tion has been drawn up after Norrl. et Nyl. Herb. Lieh. Fenn. 364. — 

 Mature spores were rare, but there were many spores of a size 5 -< 2 [j., 

 they were evidently immature. 



18. Evernia Ach. 



/. Evernia prunastri (L.) Ach. 



Østf. Kornsjø (B. L.), Prestebakke (B. L.), Fredrikssten (B. L.), Fredriks- 

 stad: Græsvik (B.L.), Larkollen (B. L.), Eleen (B. L.), Jeleen (B. L.). Akersh. 

 Høland: Skullerud (B. L.), Drobak: UUerod (B. L.). Aas (B. L.), Kristiania 



