Johnson — Ginkgophyllum kiltorkense. 175 



Another instructive fossil now known as a Ginkgophyte under the name 

 Trichopitys was described by Eenault as Bicranophyllum gallicum (13). In 

 it the leaf-scars are close together without any free intervening stem-surface, 

 and are Lepidodendron-like, as shown in Renault's figure. In this species the 

 leaves are filamentous and forked. There is, so far as the descriptions go, 

 nothing in either of the two illustrative cases to suggest that the Kiltorcau 

 stem is not Q-inkgoaceous. There is, of course, the possibility that the stem 

 described is part of the same kind of plant as that giving the forked filaments 

 seen in PL X, fig. 2, i.e. that we have at Kiltorcau a Ginkgophyllum and 

 a Trichopitys. The finest piece of stem, apparently a deeper-seated portion 

 of the same kind of stem as that shown in PI. XI, fig. 5, is illustrated in 

 PL XI, fig. 4. 



The leaf-scars appear as leaf-gaps; and the linear scar within the leaf-soar 

 seen in PI. XII, fig. 1, is missing. The space between tlie leaf -scars is occupied 

 by a well-developed system of lines or ridges forming a narrow network 

 vertically elongated. This sculpturing suggests the cortical reticulate frame- 

 work of fibres of a Lyginodendron (14). The whole stem, 5 cm. long and 1 cm. 

 wide, showing three gaps with intervening space in a widtli of 5 mm., looks 

 like a stem combining in itself characters found in part in Lyginodendron 

 and in part in Bothrodendron. The impression of this stem is roughly 

 comparable with the appearance of the skeleton of a fern-stem of erect habit. 

 Potonie (15) mentions as possibly Gymnospermous certain stems from the 

 middle Devonian of the Lenne Slates, &c. Though these are Araucarioxylon- 

 like, they are considered mostly Pteridospermous. He writes similarly of 

 certain Dicranophyllum (i.e. Trichopitys) — like remains described under 

 various names from the Devonian beds of Central Europe, Australia, and 

 Canada. 



In the course of examination of the Kiltorcau material I have searched 

 for the possible presence of seeds — a search which became more hopeful when 

 the leaf of Qhikgophyllum kiltorTcense revealed itself. Stalked bodies of the 

 same size and shape as the Heterangium-like seeds of the Carboniferous 

 Sandstone of Scotland described by Gordon, have been found ; but until I am 

 more satisfied by the examination of additional material, I prefer to postpone 

 further reference to them, beyond mentioning that they appear to be 

 Devonian seeds of, as yet, undetermined identity. Until G. kiltorkense comes 

 to light' in a more complete form, I must resist the inclination to discuss its 

 bearings on the inter-relationship of the various groups of Gymnosperms (7). 



1 1 have got a second specimen of its foliage from Kiltorcan since this paper went to press. 



