A422 Structural and Physiological Botany Sas 
that the fossils known as Stgmarza, and formerly regarded as ; 
a distinct plant, are in reality the roots of Sigillaria.] The 
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Fic. 538.—Stem of Szgz//arvia, from English Fic. 539.—Leaf-scar of Szezllaria — 
coal-bed reduced). Greserz (natural size). 
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Fic. 540.—A zxzularza Sertilis. Fic. 541.—Sphenophyllum annulatum. . 
Lepidodendra, on the other hand, had much-branched stems, 
30 or more metres in height, and 4 metres in girth, and a 
