Studies in the Bangioideae III. The Life-history of Porphyra umbilicalis (L.) Kütz. var. lociniata (Lightf.) J. Ag.1

ThePorphyra species of Helgoland (Bangiales, Rhodophyta)

“…will be discussed here first before our own observations are described. Krishnamurthy (1959), using cytological methods, investigated similar material to that on which Drew (1954) based her classical studies. The 'spores' -at that time only spores and spermatia were discriminated -developed by regular divisions of one cell of the thallus.…”

Boring Microorganisms and Microborings in Carbonate Substrates

“…O. constrictum~ however, was found only in corals from the Atlantic (Bahamas, Bermuda, Jamaica), and O. brabantium only in those from the Pacific (Palau). The regional distribution of different species of Porphyra is presumably accompanied by a similar distribution in their endolithic Conchocelis stages, but the morphology of their boring filaments does not permit species distinction (Kurogi, 1953;Drew, 1954). The difference seems more significant when endoliths from different latitudes are compared.…”

“…Shallow surface grooves continuing as endolithic tunnels were illustrated by A1exandersson (1972 lithic green alga Ostreobium evidently leaves its boreholes and assumes a chasmolithic habit in larger cavities within the substrate (Schroeder, 1972). The red algae Porphyra and Bangia are endolithic during the early stages of their life cycle ("Conchocelis" phase), but epilithic during their adult stages (Drew, 1949(Drew, , 1954(Drew, , 1958.…”

Marine algae of Helgoland: Second supplement

“…Zur Biologie von Porphyra Drew (1949Drew ( , 1954 (Drew, 1955, p.6): "On one occasion I found cells with protrusions of considerable size and in many instances from both sides of the cell, and with genuine spermatia adhering to them." Das Studium der Helgol~nder Population fiihrte weiter; es enthielt neben den ungeschlechtlichen Thalli auch beiderlei Geschlechtspflanzenl Schon in der Aufsicht auf den reifen Thallus werden die Unterschiede deutlich; die ungeschlechtlichen Sporen liegen meist in Gruppen von vier Zellen zusammen (Kornmann & Sahling, 1991, Abb.…”