1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 13 



Lich. I (1894) p. 304. OLIVIER Etude sur les . . . Physcia. Revue de 

 Botanique (1894) P- 82. OLIVIER Lichens d'Europe (1907) p. 157 

 (233) LYNGE De norske blad- og busk-laver. Berg. Mus. Aarb. 1910 

 no. 9, p. 99. 



Hagenia ESCHW. Hagenia speciosa SCHWENDENER Untersuchungen 

 fiber den Flechtenthallus in NAGELI Beitrage II Leipzig 1860, p. 162. 



Pseudophyscia speciosa. MULL. ARC. Conspectus Lich. Nov. Zeland. 

 Bull. Herb. Boiss. II, append. I (1894) p. 40. HUE Lich. Extra-Europ. I. 

 Nouv. Arch. Mus. s6r III, vol. X (1898) p. 114. HARMAND Lichens de 

 France (1909) p. 487. 



Exsic. ANZI Lich. Lang. 56. ARNOLD Lich. Exsic. 1611 a, b. FUNCK 

 Krypt. Gewachse 580. KOERBER Lichenes selecti 156 RABENHORST Lich. 

 Eur. 426, 908. SCHAERER Lichenes Helvetic! 357. TUCKERMAN Lichenes 

 Amer. Septentr. 81. 



Thallus large, 10-20 cm., orbicular or irregular, loosely appressed to 

 the substratum, pliable. Laciniae continuous from the centre, elon- 

 gate, linear, i 2 mm. broad, a little widened towards the apices, multi- 

 fid, pinnato-incise or digitato-ramose with rounded axillae, discrete or 

 subdiscrete, but with more or less imbricate lateral branches. Laciniae 

 epruinose, without isidia, but sorediate at the apices of the lateral 

 branches, sorediate apices in age occasionally ascendant or suberect, 

 forming capitate soredia. Laciniae smooth, plane, with a faint horny 

 lustre, colour white or greyish- white, moistened greyish-green, 

 lower side white. Laciniae at the margin with unbranched scattered, 0,5 i 

 mm. long cilia of the same colour as the thallus, rhizinae much branched, 

 uncoloured at the circumference of the thallus, otherwise dark. 



Thallus covered with a thin, amorphous, uncoloured, inspersely broken 

 stratum. Pseudocortex formed of thick-walled hyphae which are parallel to the 

 surface and more densely interlaced towards the surface. Pseudocortex 

 greyish at the superior part (20 40 /it), otherwise uncoloured, of a very 

 variable thickness (25 150 u). Gonidia glomerate, disposed in an irregu- 

 lar, thin, subcontinuous stratum under and also, though scattered, in the 

 upper pseudocortex. Medulla white, hyphae loosely interlaced, rather 

 thin-walled, adsperse. Medulla gradually transformed into a lower un- 

 coloured pseudocortex of the same structure as the upper one, well deve- 

 loped near the margin of the laciniae, thinner, less developed and in part 

 wanting towards the middle. Rhizinae much branched, tomentose, 50 

 TOO u thick. 



