1 92 1. No. 7. STUDIES OX THE LICHEN FLORA OF NORWAY. 215 



It prefers dry places on the mountains, and is found associated with 

 Cladoiiia alpcstris, Alcctoria ocJirolcnca, Alcdoria divcrgois and Cetraria 

 jiivalis. It is frequently seen under alpine shrubs and sometimes on their 

 twigs [Jiiiiipenis, Bctiila nana). 



Apothecia rarissima, unum solum visum. Apothecium cupulitorme, ter- 

 minale, breviter stipitatum, diam. 2 mm. (baud maturum). Discus dilute 

 badius, epruinosus, margo tenuis, evanescens. Cortex exterior crassus, us- 

 que 200 [X, parte exteriore tenui flavo-fuscescens, praeterea incoloratus, 

 hyphis pachydermaticis formatus arete contextis, parte interiore in omnes 

 partes vergentibus, parte exteriore superficiel + perpendicularibus. Cortex 

 interior 50 — 65 |j. altus, incoloratus, hyphis pachydermaticis perpendicularibus 

 arete contextis formatus. Hyphae medulläres laxissime contextae, adsper- 

 sae, sat pachydermaticae. Gonidia glomerata, praecipue infra corticem inte- 

 riorem evoluta. Hypothecium (verum) altum, usque 200 [x, omnino inco- 

 loratum. Hymenium 80 — 100 [l altum, parte exteriore dilute flavo-fusce- 

 scens, praeterea incoloratum. Paraphyses distinctae, tenues, apice non 

 incrassatae, cohaerentes, parce ramosae. Asci (haud maturi) late pyrifor- 

 mes, membrana apice incrassata. Sporae raro evolutae, incoloratae, (sem- 

 per?) binae, late limbatae, 24 — 27-12 — 16 a. — 



Hymenium J mox flavo-fuscescens (non e caeruleo), hypothecium verum 

 J caerulescit, cortices J flavo-fuscescentes. Medulla J leviter caerulescit. 



There is only one fertile specimen in our herb., detected by Norman 

 at Oxtjord in Finmarken. It carries one apothecium, small and evidently 

 not quite mature. Its texture is the same as in Cetraria, with a distinct 

 'interior cortex' under the hypothecium. 



The apothecia mentioned in my 'Blad- og busk-laver' p. 64, evidently 

 belonged to another (parasitic?) lichen. 



10. Alectoria thrausta (Ach.). 



Btisk. Krokkleven (Somrft.I. 



Hord. Granvin: Nesheimshorgje (H.), Hardangervidda: Nasna (H.), 

 and Hadlingehaug (H.). Sogn. Stat (H.). 



Opl. Ringebu: Stulsbroen (H. et B. L.). 



Sortr. Kongsvoll (Th. Fr.I. 



Fi)nu. \'aranger: Mortensnes (Th. Fr.). 



On mossy — especially slaty — rocks, rarely on the twigs of Jnni- 

 penis (Th. Fries Lieh. Scand. p. 38). 



Alectoria thrausta is a rare species in Norwa}-, but it has a wide 

 distribution. The statement in my flora 'Blad- og busklaver" that it should 

 be common in Gudbrandsdalen, seems to be doubtful. 



It is probably more common in Eastern than in Western Norway. 

 Its distribution in Sweden and Finland might indicate an immigration from east. 

 Our specimens are minutely sorediate, evidently belonging to f. sorediella Nvl. 



