OF LOWER GREENSAXD PLANTS. 9 



In two or three of the pinnules the fine raeshwork of 

 the secondary veins stands out in relief from the 

 carbonised surface. E. of Blackgang, I. of Wight. 



Caleb Evans Coll., 1887. 



V. 13078, 13079, 13080. Smaller fragments similar to the 

 above, but more imperfect. E. of Blackgang, I. of 

 Wight. Caleb Evans Coll, 1887. 



Genus TEMPSKYA, Corda (emend.). 

 [Flora der Vorwelt, 1845, p. 81.] 



The genus is founded on petrified " false-stems," composed 

 of groups of small stems ensheathed by a more or less imperfectly 

 preserved common root-plexus. 



Diagnosis. " Stems of small diameter, erect, dichotomous 

 and imbedded in a felted mass of their own adventitious roots. 

 Dorsiventral, with the leaves in two rows on one side of the 

 stem, and roots alone on the opposite side. Vascular system of 

 stem a solenostele. Leaf-trace departs as a single strand. 

 Roots diarch." 



This diagnosis is taken from the recent paper by Kidston & 

 Gwynne-Yaughan (1912), of which a resume was published 

 in the British Association Report for 1910. In 1911 Berry 

 discussed the genus and described an American species, but the 

 final paper of Kidston *fe Gwynne-Vaughan gives the first 

 satisfactory exposition of these fossils, which have been known 

 since 1824 as common Lower Cretaceous forms. As this valu- 

 able paper is unfortunately difficult of access and little known 

 to botanists, some of the figures from it are reproduced in the 

 following description. 



Under the name Endoyenites the plant was first recorded in 

 1824 by Stokes & Webb in their joint description of Mantell's 

 specimens from the Tilgate Forest (1824, p. 423). They placed 

 it among the Monocotyledons ; a view followed by most of the 

 older British writers. In 1845 linger assigned the English 

 species erosa to the genus Protopteris, and he was followed by 

 Brongniart (1849). In 1850 linger included the already well- 



