176 UKRNT I.YNGE. M.-N. Kl. 



iiitriioii li}i)()lhcciiiiii(|ii(- + f)l)sciiic na\r)-iLiscesccn.s vel flavo-rufcsccns, parte 

 exteriore obscuriiis; iiyniciiiiim f|iiani in P.saxdtili /i/i/iiiis: 6^- 80 \j., Htrato 

 amorphe incolorato tectum. l'araphyses arcte cohærentes^ apice clavato- 

 incrassatae, indivisae vel raiissime parce ramosae. Asci hyrrienio parce 

 breviores, j6 — 17 [v, crassae, membrana apice mediocriter incrassata. Sporae 

 (/iiaiii ill /\ s(ix<i/i7i parce iiuijoirs: 13 — 21/8 — 13 \i., ellipsoideae, sat 

 pachydermaticae. 



Medulla KOI! e Jlavo saugiiiiiea. 1 lymeiiium J soidide vinose coloratur, 

 asci solum caerulescentes, apices asrnrum persistenter. 



The siz.e of the spores is vai^iable. In one apothecium the variation 

 was between 21 -< 13 and i3'<8 [j.. — According to Cromp.ip: Brit. Lieh. I 

 p. 243 Paniu'lia omphalodcs has often 'slightly smaller spores than P. sul- 

 cata', but he gives no dimensions. I have been unable to confirm this, I 

 have measured slighdy longer spores in P. oiiiphalodes, but the difference 

 is insigniiicant. 



f. caesia Nyl. 



fiord. Lille Kalso (B. L.). 



Sor/r. Nordre Knutsho (B. L.). 



Troiiis. Bardo: hinset (B. L.). Fiuni. Alten: Sakkobani (B. L.), Skodda- 

 varre (B. L.), and Store Raipas (B. L.); Honningsvaag (H.), Nordkap (H.j; 

 Skjetningberg (B. L.), Mehavn (H.). 



Caesio-pruinose formae of P. saxatilis sensu latiore are common in 

 Arctic Norway. I have never seen a caesio-pruinose P. sulcata, very rarely 

 P. f randans, and but occasionally a caesio-pruinose P. saxatilis. The majo- 

 rity of them must be referred to P. omphalodcs, especially to its var. pan- 

 niformis. Caesio-pruinose P. sa.xatilis and P. oniplialodes are, however, 

 sometimes difficult of separation. 



The appearance of this same modification in different species may be 

 taken as an indication of their near relationship. It seems to me that it 

 is also an indication that these 'formae' are not very noticeable from a 

 systematical point of view, the}- might more probabh" be taken as a phy- 

 siological variation. The chemical reaction also shows that there is a distur- 

 bance in the wonted physiolog}^ of the P. saxatilis tribe in these formae. 

 The typical reaction ot the medulla is 'KOH e flavo rubescens'. The prui- 

 nose formae sometimes have this reaction, but more frequently the colour 

 is fainter: 'KOH e flavo aurantiacus' or only 'KOH flavescens'. — 



I have never seen fertile caesio-pruinose plants of P. oniplialodes. The 

 thallus is usually thinner than in P. oniplialodes typica. • 



