26 



ARKIV 1-ÖR BOTANIK. BAND 1. 



quercifolinm 



frond 3 — 5 cui long, broader 

 to the top and thus of spa- 

 thulate, obovate or broadly 

 cuneate form; 



the margin cut more than 

 half way to the midrib, of 

 which the wing is often as 

 broad as the length of the 

 segments, or about 1,5 — 2 mm; 



the lower segments in most 

 cases ovate, or broadly trian- 

 gular; all segments separated 

 by a narrow, often acute 

 sinus ; 



secondary veins running 

 out from the costa at an acute 

 angle ; 



stipes long, in the lower 

 part only more or less shaggy ; 



caudex (rhizome) not den- 

 sely tomentose, or partially 

 naked; 



young fronds frequently 

 linear or ligulate; 



involucre in most cases 

 the greater part of it free. 



Kraussii 



normal frond 2( — 3) cm 

 long, broadest at the middle, 

 of elliptical or broadly oblong 

 circumference ; 



margin cut very nearly' 

 to the midrib, which forms a 

 very narrowly winged rachis, 

 the wing hardly 1 mm; 



segments oblong or linear, 

 more patent or horizontal than 

 in quercifolium, and separated 

 by a broad, open sinus with 

 a little tooth at the bottom; 



secondar^^ veins running 

 out in a broader angle, and 

 generali}^ more distinctly 

 flexuose than in quercifolium ; 



stipes short (or frond sub- 

 sessile), thickh' tomentose all 

 the way up to the basal lobes 

 or sometimes a good way up 

 the rachis; 



caudex in most cases den- 

 sely tomentose; 



young fronds (always ?) 

 broad, roundish or ovate; 



involucre generally more or 

 less winged, or sunk in a lobe. 



With regards to the form of the lobes or primary seg- 

 ments, it must be added, that they occur in Tr. Kraussii in 

 two difi'erent shapes: the lower ones are generali}^ deeply 

 pinnatifid with long ultimate segments, and imbricate or co- 

 vering the next lobe, fig. 12, 13; this is often the case with 

 the upper segments also, when the frond is sterile. In a 

 fertile frond the upper segments are usually narrowly linear, 

 distant from each other, and almost entire or onlv toothed or 



