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Secondary cortex formation in Osmundaria prolifera (Amansieae: Rhodomelaceae)
No full textSummary 1. The development of the pericentral cells, lateral wings, and primary cortex is briefly described in the rhodophyceanOsmundaria prolifera Lamouroux. 2. During subsequent development of the blades, a large part of the outer margins of the lateral wings is lost, presumably by sand abrasion. 3. The loss of the lateral wings appears to stimulate the primary cortex into meristematic activity, thereby producing a secondary cortex, attaining a thickness of up to 0.5 cm. 4. Secondary cortex formation in this species produces leathery, terete stipes which may be an adaptation towards perennation
The lipid-soluble pigments of the marine red alga Lenormandia prolifera
No full text1. The marine red algaLenormandia prolifera contains-cryptoxanthin, a monohydroxy derivative of-carotene, as well as- and -carotene, lutein and zeaxanthin. 2. Chlorophylla and a trace of chlorophyllidea is present but no chlorophylld. 3. The chlorophyll/carotenoid ratio is 2.5 ± 0.7 (w/w), falling within the range reported for other species of the Rhodophyta. 4. -Carotene is more abundant than-carotene while lutein is the most abundant xanthophyll;-cryptoxanthin accounts for only 2.4% of the total carotenoid content. 5. The possibility that theAmansia group is distinguished by containing-cryptoxanthin and more- than-carotene is discussed
