1921. No. 7- srrniFs o\ tuf. i.iciikx flora of norwav. 53 



3. Podetia ecorticate towards their upper end. 



4. Podetia densely squamose. f. sq/Ki/iiosissi/iia. 



5. Pale, podetia well developed, squaiiuiles large, incise 



s. {. froiidosa. 

 5*. Dark, podetia ventricose, often poorly dex'eloped, squa- 

 miiles small, \'ery congested, s. f. vrii/ricosa. 

 4*. Podetia not densely squamose. f. driiticolli^. 

 3*. Podetia corticate, f. lutiltihracliiata. 



Most significant subformae: 

 4. Pale, squamules large, s. f. pliyllocoiiia. 

 4*. Dark, squamules varying, usually small towards the apices 

 of the podetia. s. f. furfacca. 

 I*. Podetia ascyphous, ecorticate towards their upper end. f. iiiuricrlla. 

 (I have seen no good t3'pes of f. polychonia). 



This arrangement agrees well with Sandstede's Clad, des n. w. deutschen 

 Tieflandes (1906) p. 423. 



f. dcnticoUis is considered the type of this species. It is more frequent 

 in Norway than any other forma. It is chiefly a forest plant, found on 

 old decayed (coniferous) stumps, mossy stones, and the like. It is, there- 

 fore, easily understood that it is less common in Northern Norway, only 

 few specimens being recorded north of Lofoten. 



Intermediate stages between f. druticolUs and f. f. iiiiiricclla and pliyllo- 

 coiiia are frequent, more distant is f. iiuiltihracliiata. There is no limit what- 

 ever between f. dciiticollis and f. sqiiaiuosissiiua which is usuall}- i-eferred 

 to the former as a subforma, and with good reason. 



f. squaiiiosissiiiui may be divided into two groups, e. g. 

 i) one pale whitish-green or whitish-grey group, directly descended 

 from f. dcnticoUis (or f. phylloconia). If the squamules are very large and 

 incise, and the podetia less well developed, often entangled, it is the i. fron- 

 dosa, quite typical stages of this f. are not rare. This group of plants is 

 chiefly distributed throughout the continental parts of Norway. They are 

 marked with an * in the above list. 



2) A group of darker plants with smaller and more densely congested 

 squamules. If the podetia are well developed the plants may be referred 

 to f. vcntricosa. But the podetia are sometimes less well developed or e\-en 

 almost lacking; such plants bear a great resemblance to CI. s/npsilis 

 (different reaction). The plants (if this group are not marked with an *; it 

 will be seen that they are chiefly maritime (especially so the plants with- 

 out podetia). 



f. iiiiiltiliracliiala is a common plant especially near the coast, on rathcr 

 dry moors, and at subalpine and al[)ine stations. It prefers dry sunny 

 places. 



There is no other forma of C. Sf/iiaiiiosa so variable as this one. A 

 few small Northern specimens agree habitually with the f. pityira as repre- 



