I92I. No. 7. STUDIES ON THE LICHEN FLORA OF NORWAY. 23 1 



Cortex omnino incoloratus vel parte exteriore leviter obscuratus, hyphae 

 conglutinatae, refractivae, valde indistinctae, praecipue basin versus, crassae: 

 8 — 16 [J., valde pachydermaticae, transverse septatae, parte interiore in 

 omnes partes, exteriore superficiel ± perpendiculares. Gonidia strato sub- 

 continuo, undulato tenui disposita, diam. lo — 13 (16) u.. Hyphae meduUae 

 exterioris + laxe constrictae, adspersae, 4 — 5 (81 ;j. crassae, septatae, parce 

 ramosae, a cortice sat distincte limitatae, ab axin subito liniitatae. Axis 

 tenuis hyphis conglutinatis, valde refractivis, thallo subparallelibus, trans- 

 verse septatis, tenuibus (2.5 — 4 a), sed pachyderniaticis, parce ramosis, 

 formatus. 



Apothecia rarissinia, ad Leirvik insulae Stord Norvegiae occidentalis 

 detexit J. J. Havaas. Apothecia mediocria, diam. 5 — 10 mm., margine et 

 disco + spinulosa, margo evanescens, discus ochroleucus. Cortex exterior 

 55 — 80 [A altus, hvphis conglutinatis indistinctis, pachyderniaticis, superficiei 

 perpendicularibus contextus, cortex interior infrahypothecialis 25 — 40 \j. altus, 

 gonidia strato incontinuo sub cortice interiori inclusa, intra corticem exterio- 

 rem dispersa solum adsunt. Hypothecium verum 25 \j. altum. Hymenium 

 Imaturum?) 70 — 85 [x altum, superne inspersum. Paraphyses conglutinatae, 

 ramosae, apice baud incrassatae. Asci in specim. immaturi, sporae carentes. 



React. Hymenium J tlavo-aurantiacum, asci solum persistenter caeru- 

 lescentes, hypothecium \erum J dilute caerulescens. 



Ad corticem Piiii silvcstris et frequenter ad rupes muscosas secundum 

 oram maritimam Norxegiae occidentalis. Fere semper sterilis, ad Leirvik 

 insulae Stord c. fr. 



Rog. Rægetjord (H.). 



Hord. Moster, Stord, and Radoen (H.I; Askoen (Lillef.I. 



J colours the cortex N'ellow with a cast of red, medulla and axis in- 

 tensely reddish-brown. Xo colour with KOH. This is also the reaction 

 of L. flor i da. 



The relative thickness of the axis and the thallus varies, but usually 

 the diam. of the thallus is ca. 4 times so great as that of the axis. At the 

 base it can be considerably thicker. 



The following measures are given as typical: 



Near the base. Middle thallus. 



Thallus diam 1800 \j. 1700 y. 1200 \j. i 100 \j. 



Axis „ 500 375 200 — 250 180 — 190 



Cortex thick 150 50 — 100 60 — 80 50 — 80 



The medulla is very loosely woven, near the axis it is onl\' a poor 

 cobweb, and the axis can be quite free, situated excentrically near the gonidia. 



V.florida has a relatively thicker axis, diam. 0.35 — 0.45 of the thalline 

 diam. Its medullary hyphae are more densely contexted, and better fixed 

 to the axis which they keep in a central position. If a section of ^'.//or/V/a 



