KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 51. N:o |0. 15 
and, although connecting links are not altogether missing, they do not form a 
complete series. From other forms Pt. Carlssomi is well distinguished. 
In a list of plants at Bjuf NATHORST (1878, p. 11) names a species Pliloza- 
mites Oldhami NaATtH. (nomen nudum). The specimens referred to are, however, as 
NATHORST (1879, p. 61) immediately after pointed out, identical with Pt. Carlssoni. 
Pt. Carlssomi is known from the Rhaetic plant-bearing deposits of Scania. It 
occurs in layers 3 and 4 at Bjuf, but is rather rare. (Bjuf 3, zone with Camptopteris 
spiralis. Bjuf 4, zone with Lepidopteris Ottonis.) 
Ptilozamites Blasil (Brauss) NArH. 
BIE LK figs: 9ycd0r pl, 2, meal; pl.3, fig.pl0. 
Nilssonia Blasii, Brauns 1862, p. 56; pl. 14, figs. 1 a—1 ec. 
> >  BrRAUNS 1866, p. 245. 
Pterophyllum Blasii, ScHENK 1867, p. 168; pl. 40, fig. 1. 
Pterozamites Blasit, ScHIMPER 1870, p. 142. 
Otozamites? Blasii, NATHORST 1876 a, pp. 35, 40. 
Ptilozamites Blasii, NATHORST 1878, p. 11. 
Sphenozamites? Braunsii, NATHORST 1878, p. 11. 
Ptilozamites Blasii, NATHorRsST 1879, p. 64; pl. 13, figs. 4—7. 
Ptilozamites sp., NATHorsT 1879, p. 65; pl. 13, fig. 8. 
Pterophyllum? Oldhami, NATHoORST 1879, p. 71; pl. 13, fig. 15. 
Ptilozamites Blasii, NATHorsT 1886, p. 123; pl. 13, figs. 8, 15. 
Frond pinnate, comparatively large, long, broadly lanceolate to almost linear. 
Rachis stout, undivided. Pinnae close, pointing somewhat upwards; large, one and 
a half times to twice as long as broad, rhomboidal, or almost square with rounded 
corners, or more or less rounded; attached by the whole of the base; distal margin 
almost straight or »-shaped; proximal margin first parallel with the distal one, then 
bent in a sharp angle. Veins numerous, coming direct from the rachis, distinct, re- 
peatedly forked, more or less radiating. Consistence moderately thick. 
The cuticle is not very thick. It is on the whole similar on both sides, there 
being only a slight difference in the lower epidermis having somewhat oblong cells 
above the veins. The cells are irregularly polygonal, and have at times somewhat 
undulated walls. On the upper side of the frond they now and then have papillae. 
Stomata are either quite lacking or very few (see p. 4). At times there are holes 
in the cuticle (see p. 4). 
BRAUNS (1862, pl. 14, fig. 1a) founded this species on a large, beautiful frond 
from BSeinstedt. The specimen in question is more than 20 cm. long, and has a 
breadth of 7-7 cm., but in a complete condition it probably measured double this 
length. The largest segment of the frond measures 4 Xx 2-3 cm., but as there are 
separate segments which reach a size of 5:5 Xx 3:5 cm., there can be no doubt that 
the species could become considerably larger. The lowest and the highest pinnae 
(pl. 1, fig. 10) are rounded and comparatively short; the others (pl. 1, fig. 9; pl. 2, 
