. Fossil plants : for students of botany and geology . Paleobotany. X] ANNULARIA. 339 about the middle, 1â5 cm. in length and 1â3 mm. broad, hairy on the upper surface'; each leaf is traversed by a single Fig. 88. Brniioh. of Annularia stellata (Sehloth.). | nat. size. Prom a specimen in the Collection of Mr E. Kidston. Upper Coal- Measures, Eadstook. Each whorl contains 16â32 segments, which are connected basally into a collar or narrow sheath; the lateral segments are usually longer than the upper and lower. The branches are about 6â20 mm. broad, with finely ribbed intemodes 3â7 cm. l
. Fossil plants : for students of botany and geology . Paleobotany. X] ANNULARIA. 339 about the middle, 1â5 cm. in length and 1â3 mm. broad, hairy on the upper surface'; each leaf is traversed by a single Fig. 88. Brniioh. of Annularia stellata (Sehloth.). | nat. size. Prom a specimen in the Collection of Mr E. Kidston. Upper Coal- Measures, Eadstook. Each whorl contains 16â32 segments, which are connected basally into a collar or narrow sheath; the lateral segments are usually longer than the upper and lower. The branches are about 6â20 mm. broad, with finely ribbed intemodes 3â7 cm. long, bearing verticils of leaves; the ultimate branches arise in pairs in the axils of the lateral segments of the verticils. The strobili are of the Calamostachys' typ6 and are borne on the main branches or possibly on the stem ; they have a long and narrow form and are attached in verticils at the nodes. Each strobilus consists of a central axis bearing alternate whorls of linear lanceolate sterile bracts and sporangiophores, about half as numerous as the sterile bracts; each sporangiophore bears four ovoid sporangia. The anatomical structure of a specimen referred to An- nularia stellata has been described by Renault'. The cortex 1 Potoni6 (93), p. 166. " Vide pp. 351 et seq. â ' Benault (96), p. 66; (98), PI. xxvm. 22â2. 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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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
