﻿152 Canadian Record of Science. 



The specimen obtained by Mr. Mixer represents the 

 base of the stem or stipe, and in this respect it is similar 

 to the recently described specimen of N. Ortoni.^ It 

 measures 56 centimeters long. At the top it is 7.5 cm. 

 broad, while at the base, where the root processes arise, it 

 widens out to 16.5 cm. Externally the surface is 

 roughened as if from the result of superficial decay, and 

 shows somewhat extended carbonized areas, within which 

 the material separates in small angular fragments. In 

 the transverse section no concentric structure is observable. 



Sections of this 'specimen were prepared by Dr. J. M. 

 Clarke, of Albany, N.Y., and forwarded to me for study. 

 They represent a fairly well preserved structure, and even 

 a hasty examination served to show that they exhibited 

 several elements of interest. 

 Transverse Section. 



The structure is somewhat altered, in consequence of 

 which the large cells are, to some extent, wanting in 

 a sharply defined outline, but nowhere was there that 

 extreme alteration met with in specimens of the same 

 species as formerly obtained from the Hamilton group 

 of New York. Nevertheless, the alteration has been 

 carried sufficiently far to render the small hypha3 lying 

 between the laro;e cells, to a OTeat extent unrecoo-nizable. 



The best material representing this species, heretofore 

 studied, was tliat originally collected by Dr. Bell from 

 Gaspe, but it was in small fragments and did not permit of 

 extended study. It, nevertheless, showed the large cells 

 of the medulla to be very perfectly preserved, and the 

 hyphse also, to be unaltered in form.^ It was upon a 

 study of this material that the diagnosis of the species 

 was first based. Later, a revision of the Celluloxylon 

 primaevum of Dawson, as represented by material from the 

 Hamilton group of New York, collected by Dr. J. M. 



> Ann. Bot. X.,41, 189(5. 



2 Trans. R. Soc. VII., iv., 20, 21. 



