RT Journal Article
T1 Sexual structures in Ptilothamnion sphaericum and Pterosiphonia complanata (Ceramiales, Rhodophyta) from the Atlantic Iberian Peninsula
A1 Díaz Tapia, Pilar
A1 Bárbara, Ignacio
K1 Pterosiphonia complanata
K1 Ptilothamnion sphaericum
K1 reproductive morphology
K1 Rhodomelaceae
K1 Wrangeliaceae
AB Sexual structures of Ptilothamnion sphaericum and Pterosiphonia complanata are described for the first time. Spermatangial heads of P. sphaericum are densely clustered in short lateral branchlets, each cell of which bears up to three spermatangial heads. They consist of a stalk cell and 3-4 axial cells bearing a cluster of spermatangial mother cells that cut-off 1–2 spermatangia. The last two cells in female axes of P. sphaericum are relatively short, with the hypogenous cell longer and more similar to vegetative cells. The subapical cell bears three periaxial cells: two sterile and the supporting cell, which bears a four-celled carpogonial branch and one sterile cell. The hypogenous cell bears 1–2 involucral filaments prior to fertilization. These features support the placement of P. sphaericum in the genus Ptilothamnion . Spermatangial branches of Pterosiphonia complanata are borne on unbranched modified trichoblasts. They consist of an elongate suprabasal cell that bears a fertile central axis from which four periaxial cells arise, bearing quadrangular spermatangial mother cells that bear the spermatangia. Spermatangial branches have 1 (-3) apical sterile cells. Procarps of P. complanata consist of a four-celled carpogonial branch and two sterile cells borne on the supporting cell. These features are similar to all Pterosiphonia species for which they have been described.
PB Walter de Gruyter
SN 1437-4323
YR 2011
FD 2011
LK http://hdl.handle.net/10347/32772
UL http://hdl.handle.net/10347/32772
LA eng
NO Diaz Tapia, P., & Bárbara, I. (2011). Sexual structures in Ptilothamnion sphaericum and Pterosiphonia complanata (Ceramiales, Rhodophyta) from the Atlantic Iberian Peninsula. Botanica Marina, 54:35-46.
NO Deputación da CoruñaXunta de GaliciaMinisterio de Ciencia e Innovación, FEDER (CGL2006-03576/BOS, CGL2009-09495/BOS)
DS Minerva
RD 22 abr 2026