X] CALAMOCLADUS. 335 



Galamocladus equisetiformis (Schloth.). Fig. 87. 



1809. Phytolithus, Martin i. 



1820. Casuarinites equisetiformis, Schlotheim^. 



1825. Bornia equisetiformis, Sternberg 3. 



1828. Asterophyllites equisetiformis, Brongniart*. 



1836. Hippurites longifolia, Lindley and Hutton^ 



1855. Calamites equisetiformis, Ettingshausen 6. 



1869. Calamocladus equisetiformis, Schimper''. 



1869. Annularia calamitoides, Schimper''. 



The above synonyms do not exhaust the list^ but they suffice 

 to illustrate the necessity of a careful comparison in drawing 

 up tables of species, in connection with geographical distribution 

 or for other purposes. 



Calamocladus equisetiformis may be briefly defined as 

 follows : — A central axis possessing a hollow pith of Calamitean 

 character, divided externally into well-marked slightly con- 

 stricted nodes and internodes; from the nodes long narrow 

 and free leaves are borne in whorls ; from the axils of some of 

 the leaves lateral branches are given off inclined at a fairly 

 wide angle to the main axis, and bearing crowded verticils of 

 spreading acicular leaves. 



The unusually good specimen, 38'5 cm. long, shown on a 

 much reduced scale in fig. 87, illustrates the characteristic habit 

 of this form of Calamocladus. It is from the Radstock coal-field 

 of Somersetshire, one of the best English localities for Coal- 

 Measure plants. An exceedingly good collection of Radstock 

 plants has recently been presented to the British Museum by 

 Mr J. McMurtrie ; it includes many fine specimens of Calamites. 

 A small example — probably of this species — from Coalbrook 

 Dale, near Dudley, in Shropshire, and now in the British 

 Museum, illustrates very well the appearance of a young and 



1 Martin (09), PL xx. figs. 4 and (>. '^ Schlotheim (20), p. 897. 



=* Sternberg (25), p. xxviii. " Brongniart (28), p. 154. 



» Lindley and Hutton (31), PI. cxci. « Ettingshausen (56), p. 28. 



7 Schimper (69), Pis. xxii. and xxvi. fig. 1. 



8 For other lists and synonyms, vide Zeiller (88), p. 868, and Kidston (86), 

 p. 38 and (93), p. 816, also Potoni6 (98), p. 162. 



