376 EQUISETALES 
it. In fact it is to be recognised that, speaking of the bracts, “a tendency 
to multiply the number of appendages in each whorl seems to have been 
Fic. 201. FIG. 202. Fic, 205. 
Archacocelamites. Part of Calamostachys. Diagram of _ Palacostachya, Di um of cone 
cone showing the axis (ax) cone in radial secti + in radial section. aa xis, which 
in surface view, _ bearing Which: bedEs sucsess: bears verticils of bracts (67) with 
superposed verticils of peltate bracts (47), and peltate sporangio- peltate — sporangiophores (sf) in 
sporangiophores (sf) without phores (sf). s777=sporangia borne their axils. Ss? = sporangia. (After 
bracts. s#c=sporangia. (After on the sporangiophores. As the Renault.) From Scott. 
Renault.) From Scott. bracts are alternate with one 
another their upturned tips are 
only shown in every alternate 
verticil. (After Scott.) 
a characteristic Calamarian feature.”! There appears, consequently, to 
have been no constant relation either of number or of radial position 
between the bracts and the 
sporangiophores. 
The relation of these 
two parts as regards vertical 
position is also. variable 
within the fossil Equise 
tales ; for, as is well known, 
the sporangiophores occupy 
in Padacostachya a position 
at the base of the internode 
Fic. 204. 
Cingularia typica, Weiss. From the Westphalian. Diagrammatic 
drawing of part ofa shoot. ™ about 2. After Weiss. (Fig. 203), in Calamostachys 
'Hickling, Ayn. of Bol., 1907, p. $82. 
