10 ARKIV FOR BOTANIK. BAND 10. w:o 15. 
Explanation of pls. 1 and 2. 
Cladotheca undans Liwspr. & Hort. sp. 
PIT 
Specimen in the Pal®obotanical Department of the State Museum 
of Natural History, Stockholm. 
Fig. 1. Portion of pinna, nat. size. 
» 2. Portions of two pinnules, 2. 
» 3. Two rows of sporangia, belonging to two different sori, 7°. 
» 4, Portion of a sorus with two rows of sporangia. The upper- 
most sporangium to the right showing the apical zone 
of thick-walled cells, 39. 
Figs. 5, 6. Portions of sori, 3°. 
»  7—10. Sporangia, 3°. 
Fig. 11. Group of spores, 185, 
>. 12) Spare, od 
PI. 
Specimen in the Sedgwick Museum, Cambridge, England.  Figured 
by Sewarp and Forp (Trans. Linn. Soc. London, 2nd. Ser. Bot., Vol. 
6, pt. 5. 1903; pl 27, fig. 4) and Sewarp (Fossil Plants, Vol. 2, 
fig. 258). 
Fig. 1. Two pinne attached to a rachis, nat. size. 
» 2. Portion of the lower pinna, showing sori, +. 
Figs. 3, 4. Sori, i$. 
Fig. 5. Sporangia, >. 
——— 
Tryckt den 3 augusti 1911. 
Uppsala 1911. Almqvist & Wiksells BoktryckerkA.-B. 
