172 LYCOPODIALES [CH. 



1875. Lepidodendron Veltheimianum, Stur, Culm Flora, p. 269, Pis. 



XVIII — XXII. 



1886. Lepidodendron Veltheimianum, Kidston, Catalogue of Palaeozoic 

 plants, British Museum, p. 160. 



1901. Lepidodendron Veltheimianum, Potoni^ Silur und Culm Flora, 

 p. 116, figs. 72—76. 



1904. Lepidodendron Veltheimianum, Zalessky, Mdm. Com. Geol. 

 Kussie, PI. IV. figs. 4, 5. 



1906. Lepidodendron Veltheimi, Potoni^, Konigl. Preuss. geol. Landes- 

 anstalt. Lief. iii. 



The above list may serve to call attention to a few sjmonyms^ 

 of this plant, and to a selection of sources from which full 

 information may be obtained as to the history of our knowledge 

 of this characteristic and widely spread Lower Carboniferous 



type- 



Lepidodendron Veltheimianum is represented by casts of 

 stems, the largest of which hitherto described reaches a length 

 of 5"S2 metres with a maximum diameter of 63 cm. ; this 

 specimen, figured by Stur'', consists of a tapered main axis 

 giving off smaller lateral shoots, some of which exhibit dicho- 

 tomous branching. Fig. 185, C and D, represent the external 

 features of a well-preserved cast and impression respectively. 

 Oblique rows of prominent cushions wind round the surface of 

 the stem and branches : each cushion is prolonged upwards and 

 downwards in the form of a narrow ridge with sloping sides 

 which connects adjacent cushions by an ogee curve. At 

 the upper limit of the broader kite-shaped portion of the 

 cushion the ligular pit forms a conspicuous feature ; imme- 

 diately below this is the leaf-soar with its three small scars, — 

 the lateral parichnos strands and the central leaf-trace. The 

 two oval areas shown in fig. 185, D, just below the lower edge 

 of the leaf-scars, represent the parichnos arms which impinge 

 on the surface of the cushions on their way to the leaves, as 

 explained on a previous page. It is possible that these areas 

 were visible on the living stem as strands of loose parenchyma 

 comparable with the lenticel-like pits on the stipules of 

 Angiopteris^ and the leaf-bases of Cyatheaceous ferns, or it 



1 See also Kidston (94), (86) A. p. 160; Potoni^ (05) Lief. in. 50. 



2 Stur (75) A. II. p. 330, fig. 34. a Hannig (98). 



