( 709 ) 



XXII. — Contributions to our Knowledge of British Palaeozoic Plants. Part I. 

 Fossil Plants from the Scottish Coal Measures. By Dr R. Kidston, F.R.S. 



(With Three Plates.) 



(Eead July 3, 1916. MS. received July 10, 1916. Issued separately November 29, 1916.) 



Introduction. 



In this series of papers it is proposed to describe new or interesting Palaeozoic 

 plants, many of which were collected several years ago. Some of these are in the 

 possession of the Geological Surveys of England and Scotland, others belong to 

 personal friends or are in the collections of public museums, while the remainder are 

 in my own collection. They come from various localities and horizons, and a few 

 from coalfields of which papers dealing with their fossil plants have already been 

 published, and they are, in many cases, additions to these lists. 



I take this opportunity of tendering my thanks to all who have so kindly helped 

 me in my investigation of the Carboniferous flora, to whose kind and sympathetic 

 assistance I owe much of my knowledge of British Palaeozoic botany. 



I am also indebted to the Executive Committee of the Carnegie Trust for a grant 

 to defray the cost of the plates which illustrate this memoir. 



In this part of the series the following species are described : — 



Sphenopteris incurva, n. sp. 



Sphenopliyllum cuneifolium Sternb., sp., forma amplum, n.f. 



Sigillaria elegans Sternb., sp. 



Sigillaria incerta, n. sp. 



Sigillaria Strivelensis, n. sp. 



Stigmaria minuta Goppert. 



Lagenospermum parvulum, n. sp. 



Sphenopteris incurva Kidston, n. sp. (PI. Ill, figs. 1, la; text-fig. 1.) 



Description. — Frond . . . ; penultimate pinnae free, rachis smooth, winged ; ulti- 

 mate pinnae alternate, linear-lanceolate, rachis straight, winged ; pinnules alternate, 

 subcuneate or rhomboidal, and bearing 1-2 pairs of narrow upward-directed decurrent 

 lobes with rounded apices, and a similar blunt, sometimes cuneate, terminal lobe, 

 which is occasionally larger than the other lobes of the pinnule. The terminal 

 pinnule frequently consists of two narrow, blunt, incurved segments with a sinus 

 between them. A single vein enters each pinnule, which gives off a veinlet 

 to each lobe. 



TRANS. ROY. SOC. EDIN., VOL. LI, PART III (NO. 22). 104 



