. Advances in marine biology: volume 17. Coral fisheries. ECOLOGY AND TAXONOMY OF Halimeda 213 This same mechanism, the development of new thalli by independent and usually horizontal growth of rhizoidal filaments away from the holdfast, may exist for rock growers as well. Certainly holdfasts and filaments of many other algae grow across rock or penetrate it, with the. Fig. 70. Two young Halimeda plants (arrowed), not yet emergent from the substrate, developing from the larger thallus by rhizoidal runners. The white conelike masses at their tips are similar to ones that form the first segments
. Advances in marine biology: volume 17. Coral fisheries. ECOLOGY AND TAXONOMY OF Halimeda 213 This same mechanism, the development of new thalli by independent and usually horizontal growth of rhizoidal filaments away from the holdfast, may exist for rock growers as well. Certainly holdfasts and filaments of many other algae grow across rock or penetrate it, with the. Fig. 70. Two young Halimeda plants (arrowed), not yet emergent from the substrate, developing from the larger thallus by rhizoidal runners. The white conelike masses at their tips are similar to ones that form the first segments in similar young plants. Development may be somewhat atj^pical because rhizoidal material, by being next to aquarium wall, has been exposed to light. The diameter of the white discs is 0-85 cm. siphonaceous alga Ostreobium, which appears to grow exclusively in rock, being a notable example of the ability of some filaments to pene- trate this substrate. There are also other methods of vegetative reproduction. Prostrate- growing Halimedae, such as micronesica, opuntia and to some extent. 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 Hillis-Colinvaux, Liewellya. London : Academic Press ; Toronto
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