242 Mr. R. Kidston on the RelationsJiip 



tlie so-called genus TJlodendron dichotomized in a similar 

 manner to that which occurs in Sigillaria and Lepidodendron. 

 In the former genus the dichotomizing of the stem appears to 

 have been much more feeblj developed than in Lepidodendron^ 

 and, in fact, there is strong evidence to show that some Sigil- 

 larim did not dichotomize at all ^ ; but in regard to other 

 Sigillarice it is equally clear that they possessed a dichoto- 

 mized ramification f- Of Sigillaria Taylori^ Carr. sp., several 

 dichotomizing examples have been found and described %. 



The termination of these Ulodendroid stems has, however, 

 only been twice observed — first by Hugh Miller §, who 

 described it as having an " abrupt cactus-like termination," 

 and the other case is that figured in PI. VI. fig. 10 (specimen 

 No. 17). This example is referable to Sigillaria Taylori^ to 

 which species Hugh Miller's fossil most probably belonged. 

 I am not aware that any termination of a Ulodendroid branch 

 of Lepidodendron Veltheimianum has ever been discovered. 

 That they dichotomized in the ordinary manner has been 

 pointed out by Tate !|. Mr. Carruthers also gives a woodcut 

 of a specimen in a similar condition %. I agree with Stur in 

 believing that Lepidodendron Veltheimianum ^ in addition to 

 bearing lateral cones (according to Stur lateral bulbils) , also 

 bore terminal cones. Mr. C. W. Peach has shown me a large 

 slab, which I believe to be referable to Leindodendron Velt- 

 heimianum^ on which are exhibited twenty-two cones attached 

 to small terminal twigs **. 



Although our knowledge of the so-called Ulodendra has 

 been considerably augmented within the last few years, and 

 to such an extent tliat it appears to me impossible to regard 

 TJlodendron^ Lindley and Hutton, as forming a true genus, 

 still there remain many points in regard to the structure of 

 these plants of which we at present possess only very imper- 

 fect information, and it is only by patient continued observa- 

 tion and collecting that we may ever hope to clear up those 

 points which are still involved in obscurity. I for one feel 

 very hopeful that many difficulties, not only in regard to the 

 Ulodendroid Lycopods, but in many other branches of fossil 

 botany, will yet be satisfactorily cleared up, only we must 



* Goldenberg, ' Flora Sarsepontana fossilis,' Heft i. p. 25, pi. B. fig. 13 

 {Si(j. reniformis) , 



t Stur, Culm Flora, p. 296 (402), pi. xxv. (xlii.) (Sigillaria Eiigenii). 



X Thompson, I. c. p. 349; PI. Miller, 'Testimony of the Rocks,' p. 464. 



§ L. c. p. 464. 



i| Tate, in Johnston's Nat. Hist, of the Eastern Borders, p. 302 (1853). 



^ Monthly Micr. Journ. vol. iii. p. 148 (1870). 



* * Collected at Grange Quarry, Burntisland, Fife, in Aug. 1876 (Calci- 

 ferous-Sandstone series). 



