A study of sclereids in the fertile parts of two members of cupressaceae
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The structure, distribution and ontogeny of sclereids in the male and female cones have been found to be very similar in eight species ofCupressus, namelyC. macrocarpa, C. goveniana, C. funebris, C. lusitanica, C. knightiana, C. sempervirens, C. torulosa, andC. lindleyi and in someJuniperus species,i.e., J. chinensis, J. formosana, J. procera, and one unidentified species. There are no sclereids in the vegetative parts. The sclereids exhibit polymorphism. The ontogeny of different types of sclereids is the same in all the species. A parenchyma cell in the ground tissue of the female cone scale or in the microsporophylls differentiates as a sclereid initial, develops branching, undergoes “secondary sclerosis” and results in the formation of a thick-walled sclereid. The taxonomic importance of these sclereids is also discussed.
KeywordsSecondary Wall Ground Tissue Vegetative Part Female Cone Male Cone
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