398 DR. E. A. NEWELL ARBER ON PSYGMOPHYLLUM FROM 
Enumeration of Species. 
1. PsyGMoPHYLLUM FLABELLATUM (Lindl. & Hutt.), ante p. 394. 
9. PsYGMOPHYLLUM MAJUS, Arber, ante p. 392. 
3. PSYGMOPHYLLUM Brownit (Dawson). 
1862. ? Cyclopteris Brownii, Dawson, Quart. Journ. Geol. Soc. vol. xviii. p. 320, pl. 12. fig. 9. 
1863. Cyclopteris Brownii, Dawson, Quart. Journ. Geol. Soc. vol. xix. p. 463, pl. 17. fig. 6. 
1871. Cyclopteris Brownii, Dawson, Foss. Plants Devon. & Upper Silur. Form. Canada, pt. i. p. 46, 
pl. 15. fig. 172. 
1882. ? Cyclopteris (Platyphyllum) Brownii, Dawson, ibid. pt. ii. p. 101, pl. 23. figs. 11-13. 
Types.—The whereabouts of the type specimens is unknown to me, and this plant is 
not, so far as I am aware, represented in any museum in this country. 
Diagnosis.—Leaf detached, large, flabellate, exceeding 10 em. in length, and 7 cm. 
across at its widest part. Base broad, margins ? curved, apex rounded, ? lobed, ? deeply 
cleft. Veins comparatively few, three or more at base, with frequent dichotomy 
throughout the lamina, comparatively distant and stout. 
Remarks.—Probably the earliest figure of this species is that given by Dawson in 1862, 
which relates to a very small portion, perhaps part of the apex of a leaf. This reference 
may be neglected. In the following year, the same author described a much more 
complete, detached leaf, which may be regarded as the true type. The leaf was, no 
doubt, imperfect, and probably the apical portion is not represented. The large slits 
shown in Dawson's figure may well be due to tearing, and may not have been a natural 
feature. This plant agrees somewhat closely with Psygmophyllum majus, Arber, but 
the nerves are apparently stronger and much more distant from one another. It is 
interesting to notice that a Sphenophyllum (the Trichomanites filicula of Dawson), very 
like Sphenophyllum tenerrimum, Stur (Pl. 44. fig. 12), occurs in the same locality, as is 
the ease also in Newfoundland. 
It appears to me to be very doubtful whether the HE i leaves assigned to this 
species by Dawson in 1882 (see above) are specifically determinable. At any rate, they 
do not appear to be obviously identical with the fossil here regarded as the type. Nor 
does it seem to me likely that Dawson’s plant is identical with Rhacophyllum truncatum, 
Lesq., as Lesquereux * has concluded. 
Distribution.—The ? Upper Devonian of Perry, Maine, U.S.A.; the Upper Devonian 
of Scaumenac Bay, Dalhousie, Canada, the latter a very doubtful record. 
4. PsYGMOPHYLLUM OBTUSA (Lesquereux). 
1858. Neggerathia obtusa, Lesquereux, in Rogers, Geol. of Pennsyl. vol. ii. pt. ii. p. 854, pl. 1. 
fig. 11. 
1879-80. Archeopteris obtusa, Lesquereux, 2nd Geol. Surv. Pennsyl. (Coal Flora) {ext (1880), 
vol. i. p. 301 P, Atlas (1879), pl. 49. figs. 6-7. 
1882. ? Cyclopteris obtusa, Dawson, Foss. Plants Erian (Devon.) and Upper Silur. Form. Canada, 
pt. u. p. 100, pl. 22. figs. 6-10. 
Diagnosis.—Lesquereux's description (1880, see above) was as follows :—* Primary 
* Lesquereux ('80), p. 312 P. 
ASIE ETT Sue Se VE E MEE T SRI 
