Jump to Main Content
- PAGE, C.N.
- Botanical journal of the Linnean Society 1972 v.65 no.4 pp. 359-397
- Equisetum; evolution; fossils; leaves; shoots
- ... Evidence is presented from new observations in morphological, anatomical and numerical fields which supports the view that in Equisetum the units of which the vegetative and fertile axes are composed are serially homologous throughout the shoot. Though greatly different in their modern morphology, these differences can be accounted for by the evolutionary specialization of each from a once common ...
- SCHEDLBAUER, MARK D.; KLEKOWSKI, EDWARD J. JR.
- Botanical journal of the Linnean Society 1972 v.65 no.4 pp. 399-413
- Ceratopteris thalictroides; cytoplasmic inheritance; ferns and fern allies; gametophytes; hermaphroditism; males; mating systems; sex ratio; spores
- ... Spores of the homosporous fern Ceratopteris thalictroides, in multispore culture, initially produce spatulate gametophytes bearing only antheridia (males) and cordate gametophytes bearing both antheridia and archegonia (hermaphrodites). When multispore cultures are sampled, the ratio of male to hermaphroditic gametophytes is a constant for each population examined. Four possible causes of such a s ...