. Fossil plants : for students of botany and geology . Paleobotany. 186 THALLOPHYTA. [CH. In section (fig. 37, A.) the lower part of the thallus is seen to be made up of rows of cells radiating out from a central point,. Fig. 37, A. Section of a recent Lithothamnion (after Eosanoff', x200). B. Section of Lithothamnion suganum. Roth (after Eothpletz^, x 100). G. A couceptacle with tetraspores from a Tertiary Lithothamnion (after Fruh^, X 300). D. Sphaerocodium Bornemanni Roth, (after Rothpletz, X 150). and the upper portion consists of vertical and horizontal rows of cells. The whole body is di
. Fossil plants : for students of botany and geology . Paleobotany. 186 THALLOPHYTA. [CH. In section (fig. 37, A.) the lower part of the thallus is seen to be made up of rows of cells radiating out from a central point,. Fig. 37, A. Section of a recent Lithothamnion (after Eosanoff', x200). B. Section of Lithothamnion suganum. Roth (after Eothpletz^, x 100). G. A couceptacle with tetraspores from a Tertiary Lithothamnion (after Fruh^, X 300). D. Sphaerocodium Bornemanni Roth, (after Rothpletz, X 150). and the upper portion consists of vertical and horizontal rows of cells. The whole body is divided up into a large number of small cells by anticlinal and periclinal walls, and possesses an evident cellular as distinct from a tubular structure. Con- ceptacles containing reproductive organs are either sunk in the thallus or project above the surface. The two types of structure in a single thallus are shown in fig. 37, A, also a conceptacle containing tetraspores. In the closely allied Liihophyllum the thallus is encrusting, and in section it presents the same appearance as the lower part of a Lithothamnion thallus. Species of Lithothamnion occur in the Mediterranean Sea, and are abundant in the arctic regions'*, while on the British coasts the genus is represented by four species'* Some large 1 Rosanoff (66) PI. vi. fig. 10. 3 Fruh (90) fig. 12. 5 Holmes and Batters (90) p. 102. â ' Rothpletz (91) PI. XVII. fig. 4. * Kjellman (83).. 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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