Gracilaria cervicornis (Turner) J.Agardh

Resendiz, María Luisa Núñez, Dreckmann, Kurt M., Sentíes, Abel, Wynne, Michael J. & Tejera, Hilda León, 2019, Marine red algae (Rhodophyta) of economic use in the algal drifts from the Yucatan Peninsula, Mexico, Phytotaxa 387 (3), pp. 219-240 : 232

Gracilaria cervicornis (Turner) J.Agardh

Thallus delicate, smooth, purple red, 9–16 cm long, with flattened axes in cross section, 460–580 μm x 1500 –1650 μm in diameter. Main axes branching dichotomously; branches constricted at their bases, covered with marginal proliferations arranged alternately opposite giving an aspect of deer horns ( Fig. 37 ). Pseudoparenchymatous organization, with an abrupt transition between medulla and cortex ( Fig. 38 ). Medulla with 10–12 layers of semi-rounded cells, 30–48 μm x 50–120 μm in diameter. Subcortex with 1–2 layers of rounded cells, 15–20 μm in diameter. Cortex with two layers of elongated cells, anticlinal, very pigmented, 8–14 μm in diameter.

Figures

FIGURES 28–38. 28–29. Meristotheca cylindrica. 28. Medullary filaments and cortical cells. Scale bar = 140 μm.29. Immature cystocarp. Scale bar = 220 μm. 30–32. Tepoztequiella rhizoidea. 30. Habit. Scale bar = 3.5 cm. 31. Medullary filaments and cortical cells. Scale bar = 90 μm. 32. Tetrasporangia basally attached (arrowhead). Scale bar = 30 μm. 33–34. Gracilaria blodgettii. 33. Habit. Scale bar = 2 cm. 34. Medullary and cortical cells. Scale bar = 140 μm. 35–36. Gracilaria caudata. 35. Habit. Scale bar = 4 cm. 36. Medullary and cortical cells and a mature cystocarp. Scale bar = 310 μm. 37–38. Gracilaria cervicornis. 37. Habit. Scale bar = 3 cm. 38. Medullary and cortical cells. Scale bar = 150 μm.