86 TRANSACTIOXS, NATURAL HISTORY SOCIETY OF GLASGOAV. 



Bothrodendron punctatum, L. &, H., ramified by repeated 

 dichotomy.^ This species is rare in Britain, and I have never had 

 the good fortune to meet with any specimens on which the leaf- 

 scars are well preserved. The fructification of Bothrodendron 

 picnctatuin consisted of sessile cones borne in two opposite vertical 

 rows, which gave rise to the cup-like depressions on the stem. 

 I have seen a number of specimens of the plant in this condition, 

 and they can easily be distinguished from the so-called Ulodendra 

 by the umbilicus of the scar being always placed near the lower 

 margin. The stems attained to great size, as indicated by the 

 size of the cone-scars, which reached a longitudinal diameter of 

 four inches (No. 1671). 



It has also been shown by Zeiller that the genus Rhytidoden- 

 dron, Boulay, is not generically distinct from Bothrodendron, 

 L. ckH. 



Bothrodendron minuti/olium, Boulay sp. (fig. 14), is by far the 

 most common member of the genus, and is frequent in the Middle 

 and Lower Coal Measures of Britain. Like 

 BotJi,rodendroib jnmctatum it possesses a 

 wrinkled and corrugated bark with small 

 oval leaf-scars whose lateral angles are not 

 prominent, but differs from B. punctatum 

 in having its fructification in the form of 

 narrow lanceolate cones which terminate 

 the small branchlets. 



On the smaller and young branches of 



Fi<r. 15. Bothrodendron Bothodendron minutifolium, Boulay (and 



mimUifolium, Boulay probably on other species also), the leaf- 

 sp. Leaf -scars from gg^rs are situated on approximated, slightly 

 young ranci, eu- gjgyg^^g^] elongate rhomboidal cushions, 

 larged (No. 156S). " ^ i vi « 



which are ornamented with line corruga- 

 tions. The young branches exhibiting these rhomboidal cushions 

 might easily be mistaken for Le-pidodendron twigs. 



At an early period, probably from the increase of the stem in 

 girth, the cushions are entirely effaced and the leaf-scars become 

 distant. As the leaf-scars become more distant, the corrugations 



1 See Zeiller, I.e., PI. VIII., figs. 2, ia, 2c, 3, and 3a; also Flore fots. 

 Bassin houii <ie Valencifinies, PI. LXXVI., fig. 1. 



