. Fossil plants : for students of botany and geology . Paleobotany. 364 [CH. there are a few records of fertile fronds which, though not to be accepted without reserve, are worthy of more careful examina- tion. Some petrified sporangia described by Renault' from the Culm of Esnost are referred to Hymenophyllites on account of the position of the annulus, which appears to encircle about two-thirds of the circumference ; it is, however, not certain that the annulus is horizontal as in the recent genus. The Culm species Rhodea patentissima described by Ettings- hausen^ as Hymenophyllit
. Fossil plants : for students of botany and geology . Paleobotany. 364 [CH. there are a few records of fertile fronds which, though not to be accepted without reserve, are worthy of more careful examina- tion. Some petrified sporangia described by Renault' from the Culm of Esnost are referred to Hymenophyllites on account of the position of the annulus, which appears to encircle about two-thirds of the circumference ; it is, however, not certain that the annulus is horizontal as in the recent genus. The Culm species Rhodea patentissima described by Ettings- hausen^ as Hymenophyllites patentissima and subsequently. F^^^^ A. E. Senftenbergia elegans. B. Oligocarpia Brongniartii. C. Trichomanes sp. D. Hymenophyllum tunhridgense. F, G. Sphenopt'eris (Hymenophyllites) quadridactylitgs. (A, B, F, G, after Zeiller ; D, after Hooker ; E, after Stur.) referred by Stur^ to Rhodea, is regarded by these authors as closely allied to Hymenophylluvi simply on the ground of the finely divided and delicate sterile fronds ; another species, Rhodea moravica (Ett.), which Ettingshausen referred to Trichomanes, is compared with recent species of that genus. In neither case do we know anything of sporangial characters. A fertile sphenopteroid frond figured by Schimper as Hy- menophyllum Weissi^ from the Coal-Measures of Saarbrucken 1 Eenault (96) A. p. 19. 3 Stur (75) A. p. 36, PI. ix. figs. 1â9. 2 Ettingshausen (66) PI. vii. fig. 4. â » Schimper (74) A. PL xxviii. fig. 4- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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