

Genus Pothoeites, Pater son. 



311 



rough. 



The upper surface of this u receptaculum " is unevenly 



lie further points out that the four u lappets " of the 



shield are only indistinctly separated 

 from each other, being isolated only 

 at the outer edge, but towards their 

 inner grown together. Their divi- 

 ding line is indicated by a shallow 

 radial furrow j this, he thinks, may 

 perhaps mark the point of the at- 

 tachment of the " shield" to a stalk. 

 Stur also thought it very probable 

 four 



that four sporangia hung from 

 inner surface of the shield 



the 



y and that, 

 in consequence of pressure, their pre- 

 sence had caused the four slight ele- 

 vations or u lappets " on the upper 

 surface. 



According to this view, he thought 

 it highly probable that the fruit of 



Fruit of Banna (Arehtm- Bo ™\ a included ^ several internodes 

 calamites) radiata, Brongn. and that on the axis, between the leal- 

 (FromStur's' Culm-Flora/ whorls, several whorls of " recepta- 

 129.) cala" were borne; these consisted 



of a stalked, slightly lappeted shield, 

 surface four or five 



P 



sporangia. 



He 



bearing on its inner 



also believed the sporangia were (in opposition to re- 

 cent Equisetum) elliptical, flattened, and granulated, about 

 1*4 millim. long by 0'6 millim. broad. One of the sporangia 

 showed a beak-like projection at one end, which he thought 

 indicated its point of attachment. He goes on to state that 

 the stem, a small portion of which was exposed in the cone, 

 was not jointed. 



There are several points in this description which agree 

 entirely with the Scotch specimens. Stur appears, however, 

 to have been misled in some particulars by the imperfection of 

 the example on which his opinions were founded. 



We see here again, as in the other figures of this author 

 already cited, the division of the fruit into segments. 



The leaf indicating the nodal region, to which reference has 

 already been made, springs from a point a little lower down 

 the axis than the part where the axis is exposed ; hence the 

 node is not seen. In plants of this class the presence of a 

 leaf indicates the presence of a node. 



In the Eskdale plant this is clearly shown ; but one of 

 Star's figures also shows the same character*. 



But the most important structural point of agreement be- 



* Loc. cit. pi. iii. tig. 5. 



