An Introduction to Paleobotany by Chester A. Arnold

By Chester A. Arnold

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Shield- diameter, was probably spores without triradiate ridges a centimeter or less in borne on an upright stipe. Numerous were produced in cavities within the thallus. TH K NEMATOPH VT A L us name was recently proposed for certain Silurian and Devonian of unknown relationship in which the plant body consists of a This plants (B) (A) (A) Prototaxites Logani. Transverse section. X about 100. (B) Prototaxites Logani. Bay, Quebec. X about 100. Devonian. Scaumenac Bay, Quebec. FIG. 22. system of interlaced tubes.

4 microns broad. The rods are rounded at the ends, and are single or are joined two or three cells. into chains of These are but two examples of that have received specific names. supposed Many fossil bacterial organisms others could be cited, but to THE NONVASCULAR PLANTS 43 do so would serve no useful purpose because of our meager knowledge them. No satisfactory test has been devised for distinguishing between the remains of bacterial cells and small particles of flocculent material or minute crystals.

Muscineac, Foss. , II. Plantac, Pars 13, Berlin, 1927. A. FENTON: Algal reefs or bioherms in the Belt series of Montana, Geol. Soc. America Bull. 44, 1933. Pre-Carnbrian and early Paleozoic algae, Amer. Midland Naturalist, 30 (1), : 1943. : State Mus. Algal barrier reefs in the Albany, 1938. Lower Ozarkian of New York, New York Bull. : Discovery of life in the Archean, Jour. Geology, 33, 1925. : Naiadita, a fossil bryophyte with reproductive organs, Ann. BryoL, 12* 1939. Plants that form reefs and islands, Sci.

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