CARBONIFEROUS LYCOPODS AND SPHENOPHYLLS. 53 



IV. Lepidophloios, Sternberg, 1826. 



1826. Lepidophloios, Sternberg. Essaiflore monde prim., Vol. I., 



fasc. iv., p. 13. 

 1833. Halonia, Lindley and Hutton. Fossil Flora, Vol. II., 



pp. 11-14. 

 1836. Pachyphlceus, Goppert (in part) t Die foss. Farrnkrduter, 



p. 468. (Nova Acta Acad, C.L.C. Nat. Curios. Vol. 



XVII. Breslau.) 

 1838. Zamites, Presl, in Sternberg (in part). Vol. II., fasc. 



7 and 8, p. 195. 

 1848. Lomatophloios, Corda, Beitr. z. Flora d. Vorwelt, p. 17. 

 1855. Cyclocladia, Goldenberg (not L. and H.). Flora Sarozpont. 



foss., Lief. I., p. 18. 



Plants of arborescent growth with dichotomous ramification. 

 Stems and branches bearing well-developed scale-like leaf-cushions, 

 at or near whose summit is placed the leaf -scar. Leaf-cushions 

 imbricated, pedicel-like, upright or deflexed, exposed portion 

 with slightly curved or straight sides or rhomboidal in outline, 

 smooth or carinate, sometimes provided with a small tubercle 

 immediately beneath the leaf-scar. Leaf-scar transversely oval, 

 rhomboidal, or rhomboidal-elongate, lateral angles rounded or 

 acute, upper and lower angles generally rounded, sometimes 

 pointed. Within the leaf -scar are three punctiform cicatricules, 

 of which the central (vascular) is sometimes the largest, and 

 occasionally triangular in form. Fructification borne on 

 specialized branches, and consisting of deciduous stalked cones 

 arranged in several spirals (Halonia). In the corticated condi- 

 tion the Halonial protuberances rise little above or are on a level 

 with the bark, and are surrounded by a circle of deflected leaf- 

 cushions; when decorticated the fruiting branches bear several 

 spiral rows of tubercle - like prominences. Leaves linear, 

 lanceolate, entire, single-nerved. Sub-cortical cicatricule single. 



Remarks. — The genus Lepidophloios is not so commonly met 

 with as Lepidodendron and Sigillaria, and contains a very much 

 smaller number of species; still it is fairly common in Britain. 

 Lepidophloios Scoticus, Kidston, is frequent in the oil-shales and 

 associated rocks of the Calciferous Sandstone Series ; 

 Lepidophloios acerosus, L. and H. sp., is not very uncommon in the 



