Anatomy and Sorus Development of Camptosorus rhizophyllus

Publisher Website
Google Scholar
Abstract
Leaf bases diverge from all sides of a radial rhizome ''which has an unperforated dic-tyostele with curving meristeles bordering leaf gaps. Each half of the binary leaf trace arises laterally in the lower part of the leaf gap. They merge in the petiole, forming a trace usually V-shaped in cross section. The "pinna-trace" is marginal. A single root trace arises just below the opening of each leaf gap. Multicellular glandular hairs are found on young leaves; lattice-thickened, glandular-tipped scales on petiole bases and rhizome tip. Leaves contain no palisade tissue, have chloroplasts in the epidermis, a heavy layer of cutin, and stomata only in the lower epidermis. Simple hydathodes occur on the upper surface at the tips of lateral veins. Sori are elongated, scattered irregularly on the reticulated veins, and covered by a membranous indusium attached laterally. The sorus develops when the leaf is still young but after maturation has started. Initiation of the indusium is followed by sporangia appearing in at first slightly gradate but later distinctly mixed sequence. Sporangia vary in size. The stalk is largely one-rowed. Spores are bilateral with perispore. Camptosorus show resemblance to both Asplenium and small forms of Blech-num in habit, dermal appendages, and rhizome anatomy; to Asplenium in leaf trace, pinna-trace, vegetative propagation, sporangia, and spores; and to Blechnum punctulatum var. krebsii in soral arrangement. There appears to be more evidence for allying Camptosorus (and what appears to be its closest relative, Phyllitis) to the Asplenioids than to the Blechnoids.

This publication has 1 reference indexed in Scilit: