科研之友
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摘要
Eight collections of the type material of Lithothamnion engelhartii from Cape Jaffa and Kingston (South Australia) were re-examined and two disparate entities were shown to be included. Some specimens exhibit embedded conceptacles in the thallus where the perithallium dominates. The other specimens lack embedded conceptacles and the thallus is formed by unattached-superimposed lamellae where the hypothallium prevails. The lectotype selected here fits the second description and is in agreement with most other type specimens and recent material collected at Eyre Peninsula (South Australia). The lectotype specimen displays dorsiventral organization lacking perithallial protuberances. The hypothallium is polystromatic with coaxial to non-coaxial regions and forms a relatively thin ascending perithallium. Subepithallial cells are elongate and support single flattened epithallial cells. Multiporate conceptacles are bisporangial, develop in dense aggregations, and do not become embedded in the thallus (except via superimposition of new lamellae). Pore canals are conical to pyriform and develop differentiated cells lining the canals along the base. Syntype material exhibits simple spermatangia, and this character, together with the presence of elongate basal pore cells and the lack of a predominantly coaxial hypothallium, suggests an affiliation with the temperate species of Leptophytum from the NE Pacific.
- 出版日期2017-2
