FEOM THE HTJTTON COLLECTION. 105 



cortex on which the small apertures for vessels connected with 

 the leaf-scars are preserved. It is much to be regretted that 

 many authors still consider these large stem-scars of Ulodendron 

 majus as a good genus and species. A short examination of good 

 specimens would soon dispel this illusion. 



The most interesting question connected with Ulodendron is 

 what are these large oval scars ? that run, so far as we know, 

 from the very base of the stem, and must therefore have been 

 present in the young state of the plant, to the highest part, and 

 even along the branches, for bifurcations in Ulodendron are 

 known. The earliest suggestion was that they are the bases of 

 fertile cones which have dropped off and left their scars behind. 

 As these scars seem to have been present even on the youngest 

 plants this suggestion seems improbable, and, besides, no cone 

 has been found associated with these stems that would correspond 

 to the size and shape of even the smallest scars. Are they then 

 frond-scars? surfaces similar to the large scars of giant tree-ferns. 

 This seems to me the most plausible suggestion, but no support 

 is given to it by the remains found in connection with this plant. 

 Another suggestion occurs, and that is, have aerial roots been 

 attached to these scars like the rootlets seen on the stems of 

 some species of recent Lycopods ? We have no absolute proof of 

 this, and, indeed, all we know of Ulodendron is limited to im- 

 pressions of the bark, of the stem, of the leaf-scars, and of the 

 leaves which are sometimes attached to portions of the stem, and 

 which bear a strong resemblance to the leaves of Lepidodendron. 



LEPIDOPHLOIOS, Sternberg. 



{HALONIA, L.etH.) 



Lepidophloios laricinus, Sternberg. 



Type — Lepidodendron laricinum, Sternb., Yers., pi. 11, 



f . 2, 3, 4. 



Lepidodendron dtchotomum, Sternb., Vers., pi. 2. 



,, acerosum, L. et H., Foss.Flora,pl.7,f.l; pi. 8. 



Lepidostrolus pinaster, L. etH., Toss. Flora, pi. 198. 



Pinus anthracina, L. etH., Foss. Flora, pi. 164. 



Lepidophloios laricinus, Schimp., Traite, pi. 59, f. 4; pi. 60, 



f. 11, 12. 



