Fig 1. Sequential photographs of spore cell division, germling development and formation of germination disc in Porolithon cf. onkodes.

Sequence shows spores after (a) four, (b) ten, (c) twenty-two, (d) twenty-eight, and (e) forty-four hours from spore release. Unsuccessful germination included those spores that neither initiate cell divisions nor formed a germination disc (indicating by *) and died or detached from petri dish (red triangle).