1 Sentences With "bore rigid"

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Uniquely among the Rhynie chert plants, aerial stems bore rigid hairs or spines made up of single cells. Stems appear to have grown from coiled (circinnate) tips, in a manner similar to modern ferns. Stems contained circular exarch xylem strands with tracheids showing both annular and spiral thickening. The upright spore-forming organs or sporangia were made up of two 'valves', the larger one facing away from the stem and bearing hairs, the smaller facing towards the stem and apparently not bearing hairs.