Gelidium floridanum W.R.Taylor, 1943

Jamas, Mayra, Iha, Cintia, Oliveira, Mariana C., Guimarães, Silvia M. P. B. & Fujii, Mutue T., 2017, Morphological and molecular studies on Gelidiaceae and Gelidiellaceae (Gelidiales, Rhodophyta) from Brazil with description of the new species Gelidium calidum, Phytotaxa 314 (2), pp. 195-218 : 204

Gelidium floridanum W.R.Taylor

Figs. 5 C ; 6 E–J

Thalli are attached, vinaceous-red, up to 7.5 cm. Pinnate branching from the second third of the thalli, which may be alternate or irregular up to third order ( Fig. 5 C ). Apex obtuse, with the apical cell between two lobes ( Fig. 6 E ). Abundant rhizines concentrated in medulla ( Fig. 6 F ). Brush-like haptera. Tetrasporangia sori generally surrounded by wide sterile margins that internally contained many rhizines ( Fig. 6 G ). Tetrasporangia divided decussately cruciate ( Fig. 6 H ). Cystocarps bilocular ( Fig. 6 I, J ).

Figures

FIGURE 5. Habit of the Gelidiaceae species. A–B. Gelidium crinale (A:SP469061, B:SP469067). Scale bar = 1 cm. C. Gelidium floridanum (SP469068). Scale bar = 2 cm. D. Gelidium lineare (SP469091). Scale bar = 1 cm. E. Gelidium microdonticum (SP469070). Scale bar = 0.5 cm.

FIGURE 6. A–D. Gelidium crinale. A. Detail of the apical portion showing the prominent apical cell (arrow) (SP469067). Scale bar = 25 μm. B. Cross section of the middle region of the main branch, showing abundant rhizines between medulla and inner cortex (SP469061). Scale bar = 20 μm. C. Tetrasporangial branch (SP469061). Scale bar = 250 μm. D. Cross section of the tetrasporangial branch, showing tetrasporangia and presence of sterile margin (SP469061). Scale bar = 100 μm. E–J. Gelidium floridanum (SP469068). E. Detail of the apical portion showing the apical cell (arrow). Scale bar = 25 μm. F. Cross section of the middle region of the main branch showing rhizines in the medullary region. Scale bar = 20 μm. G. Tetrasporangial branch. Scale bar = 250 μm. H. Cross section of the tetrasporangial branch, showing sterile margin. Scale bar = 100 μm. I. Female gametophyte branches with cystocarps. Scale bar = 2 mm. J. Cross section of bilocular cystocarp showing carposporangia produced in both sides. Scale bar = 100 μm.