CHAPTER XXX. 
THE OEGANIC EEMAINS OE THE IPSWICH EOEMATIOH 
(OPPEK TRIAS-JUEA), 
With Descriptions oe the Species. 
Kingdom — PLANT.®. 
Section-CRYPTOGAMIA. 
Class — Acottledones. 
Order-CALAMARIEA:. 
Eamily— EQUISETACE.E. 
Oenus — EQUISETUM, LinncBus, 1778. 
(Gen. Plantarum, 551.) 
Eqhisethm; rotieeetjm, Ten. Woods. 
Eqidsetwin, rolifcrunif Teu. Woods, Proc. Linn. Soc. N. S. Wales, 1882, vii., Pfc. 3, p. 344, 
,, „ Ten. Woods, loc. cit., 1883, viii., Pt. 1, p, 06, t. 6, f. 5 and 6. 
Sp. Char. “Stem cylindrical, closely and faiatly grooved, joints approximate 
below, distant above, leaves carinate, conate into a slieath, tlio teeth, of which are short, 
flat, round, of equal width throughout, adpre.ssed to the stem. The diaphragmata of 
the joints and leaf-scars of the branches are very distinct, round, with radiate lamiuse 
varying from eighteen to thirty, and a central orifice. Fructification unknown.” 
Obs. The general appearance of the fragmentary remains of this plant is thus 
given by the Eev. J. E. T. W oods. “ There are certain disk-like forms of rather an 
ornamental character. They are shaped like toothed wheels, with a small central 
perforation, and a radiate ring of pear-shaped perforations near the edge.” The present 
plant appears to be related to Equisetum rnjmahalensis* the diaphragm in the two 
species being similar. 
In PL 16, fig. 9, a phragma of an equisetaceous plant is figured. Although twice 
the natural size, it will be seen that this is far larger than the specimen figured by the 
Eev. J. E. T. Woods. Hntil we know more of the fragmentary remains of these 
Mesozoic plants it would be rash to determine such a specimen. From the same locality 
as the last plant referred to, a portion of a stem has been obtained. It is an internode 
of rather more than one inch in length and about seven-sixteenths of an inch broad, and 
the surface microscopically striate parallel to the longer axis. One of the ends is 
terminated by a well-marked point of articulation. 
Loc. Walloon Mine, Ipswich. Grey fireclays above first coal-seam (The late 
Eev. J. E. T. Woods-, Macleay Museum, Hniversity of Sydney). Stewart’s Creek, 
near Eockhampton (The lute James Smith). 
* Mem. Geol. Survey of India; Paleontologia Indica; Fossil Flora of the Gondwana System. Oldh.-vm 
.and Feistmantel, Vol. i., PI. 11, f. 3. 
