188 ROYAL SOCIETY OF CANADA 
sented, I think a fair deduction may be drawn that this terrane for the 
present at least may be treated as Upper Devonian. 
Following in succession botanically to the species last described 
one may here introduce another thallophyte. 
RHIZOMORPHA POLYMORPHA, n. sp. Plate I, figs. 2 and 3. 
The mycelium grows first into an oval dise and, subsequently, 
expands into a succession of oval lobes in one or more series. The 
original disc and these lobes are thin, round-pointed and flat, with 
knife-like edges. When from any cause they are crowded laterally, 
they show a disposition to extend into narrow linear lobes, and then are 
quite different in appearance from the more simple original growth. 

Fic. 2.—Rhizomorpha polymorpha. Mycelium in its simplest form, 
on a branch of the stipe of Aneimites Acadica. 
This fungus was found only on the primary and larger secondary 
branches of the stipe or stem of Aneimites Acadica, Dn. It is apt to 
occur in the forks of these larger branches where the imprint of the 
vascular bundles is wanting, or irregularly curved: though it is also 
seen impressed on the straight stems between where they branch; here 
it takes an oval form with the longer diameter of the disc parallel to 
the length of the stem. 
This parasite grew in the succulent layer between the epidermis 
and the band of vascular tissue, that supported the stout stem of this 
great fern. 
Size.—The observed examples have a length of about 10-50 mm., 
and a width of about 6-30 mm. 
Horizon and Locality.—In the soft gray shales of Mill Brook, Gas- 
pereau R., N.S. Infrequent. 
EXPLANATION OF FIGURES OF RHIZOMORPHA POLYMORPHA on Plate [. 
2.—Mycelia, showing primary and secondary growths—on fork of stipe of 
Aneimites. The lighter coloured part is the fungus. 
3—Mycelia showing elongated growths—on fork or stipe of Aneimites. 
The central third of the plate shows the fungus. All natural size, 
and from Upper Devonian Shales of Gaspereau R., N.S. 
N.B.—These will be natural size when reduced to one half diameter. 
