295 
the Periderm of Fossil Lycopodiales. 
way on the inner side of the supposed phellogen line (see Text-fig. so, b). 
Text-fig. 9, B, shows signs of the phellogen in one of these wide-celled 
Stigmariae in which none of the inner portion of the periderm is preserved. 
This determination agrees in the main with that of Seward, except 
that he considers the first type as a younger stage of the second 1 (but 
the specimen of type i shown in PI. XXIV, Fig. i, for example, has more 
wood than the specimen of type 2 shown in PL XXIV, Fig. s), while it 
would also reconcile the views of Solms 2 and Scott 3 that the phellogen 
was on the inner side of the periderm, inferred from type i,and of William- 
A 
Text-fig. 9. Transverse sections showing indications of the phellogen, ph, in Stigmariae; 
A, type 1. Will. Coll., 764. B, type 2. U.C. L. Coll., CC 7 h. The tissues on the inner side are 
not preserved, x 265. 
son 4 that it was near the outer margin, inferred from specimens of type 2 
with a large development of the regular inner portion of the tissue. 
In the following species no satisfactory indications of the position 
of the phellogen have been found during the present investigation, but 
in certain cases other observers have made comments as to its position, 
and these are given below : 
Lepidodendron Harcourtii and Hickii. Scott 5 and Seward 6 consider 
that the phellogen is near the centre of the periderm. Bertrand thought 
it was on the inner side. 7 
Lepidodendron brevifolium. There is some indication that the phel- 
logen was near the outer margin of the secondary tissue, where there 
1 Seward (28), pp. 243-4. 2 Solms-Laubach (30), p. 274. 
3 Scott (24), p. 247, 2nd ed. 4 Williamson (43), p. 21. 
6 Scott (24), p. 139. 6 Seward (28), p. 161, Fig. 179. 
7 Bertrand (3), p. 86. 
