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T1 The red algal genus Liagora (Liagoraceae, Rhodophyta) from the Canary Islands
A1 Afonso Carrillo, Julio
A1 Kvaternik, Diana
A2 BotánicaEcología y Fisiología Vegetal
A2 Botánica Marina
AB Eight species of the genus Liagora (Liagoraceae, Rhodophyta) are reported from the Canary Islands. Six of these (L. viscida(Forsskal) C. Agardh, L. distenta (Mertens) Lamouroux, L. gymnarthron Borgesen, L. canariensis Borgesen, L. maderensisKiitzing and L. tetrasporifera Borgesen) are endemic to the NE Atlantic and Mediterranean and two (L. valida Harvey andL. ceranoides Lamouroux) have a wide distribution. L. maderensis, known only from the type collection and often cited asa synonym for L. ceranoides or L. valida, has a reproductive and vegetative morphology that supports its recognition asan independent species. Evidence suggests that L. gymnarthron has often been erroneously identified as L. distenta (Mertens)Lamouroux and that the latter species has thus been characterized by a combination of features from two different taxonomicentities. Although closely related, the two species show distinctive differences in the morphology of their cystocarps: inL. distenta sterile filaments persist under the gonimoblast and do not surround the mature carposporophyte, while inL. gymnarthron mature carposporophytes are surrounded by a conspicuous involuc�e. Habit, vegetative and reproductivedevelopment have been examined in the eight species. The previously controversial reproductive development in L. viscida,the lectotype species of the genus, has been clarified. Gametophytes of L. viscida are monoecious and, after presumedfertilization, cells adjacent to the supporting cell form sterile colourless filaments that grow and branch towards the thallussurface; simultaneously gonimoblast initials produce outwardly radiating lax gonimoblast filaments that form terminalcarposporangia, resulting in a mature carposporophyte with sterile filaments intermingled with the gonimoblast filaments.The features used at present to delineate the genus Liagora in the Liagoraceae are analysed and the potential use of postfertilization characters to subdivide the genus is discussed.
YR 1995
FD 1995
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RD 25-abr-2024