CARBONIFEROUS LYCOPODS AND SPHENOPHYLLS. 



85 



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lateral angles more or less prominent, containing three puncti- 

 form cicatrices. Resting on or a short distance above the leaf- 

 scar is a small circular cicatricule. Leaves small, lanceolate, 

 single-nerved. Fructification in the form of cones, terminating 

 delicate branches [Both, minuti folium, Boulay). or sessile and 

 placed in two opposite vertical rows « 



{Both, punctatum, L. & H.), which 

 form cup-like depressions on the older 

 stems, and whose umbilicus is below 

 the centre and near the lower margin. 



Subepidermal leaf-scar double (Both, 

 minuti folium), in other species single (?) 

 The internal structure of the stem is 

 unknown. 



Remarks. — Bothrodendron comprises 

 a small but most interesting class of 

 Lycopods, about which, however, there 

 is still much to learn. From the some- 

 what imperfect description of the genus 

 by Lindley and Hutton, and the absence ™ 

 of enlarged drawings of the leaf-scars, 

 it was presumed by several writers 

 that the genus Bothrodendron had 

 been founded on a decorticated speci- 

 men of Sigillaria discophora, Konig 

 sp. (= Ulodendron minus, L. & H.), and this erroneous view I 

 also originally held. 



M. Zeiller has, however, shown most conclusively that 

 Bothrodendron forms a most distinct and clearly-defined genus 

 and at my request most kindly figured and described a specimen 

 of Bothrodendron punctatum, L. & H., from Newcastle, presented 

 by Hutton in 1836 to the Museum of Natural History, Paris, on 

 which the leaf -scars are very well preserved. 1 



The leaf-scars are very minute, and the leaves, which are 

 broadly lanceolate, resemble very much those of some 

 Lycopodium. 



g. 14. — Bothrodendron min- 

 utifolium, Boulay sp. a, 

 Portion of stem, natural 

 size ; b, leaf -scar and orna- 

 mentation of bark, en- 

 larged. 



1 Bull. Geol. Soc. de France, 3rd Ser., Vol. XIV., p. 168, PI. VIII., 

 figs. 1 and la. 1885. 



