Gracilaria mammillaris (Montagne) M.Howe

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 mammillaris (Montagne) M.Howe

Thallus cartilaginous, reddish purple, 6–12 cm in length, extended, with flattened axes in cross section, 270–295 μm x 885–940 μm in diameter. Trichotomous or irregular branching; branches without evident basal constrictions but with variable diameters along with a tendency to decrease towards the bases, with smooth surfaces and curved apices ( Fig. 44 ). Pseudoparenchymatous organization, with an abrupt transition between medulla and cortex ( Fig. 45 ). Medulla with six layers of irregular cells, 22–58 μm x 66–110 μm in diameter. Subcortex with two layers of elongated cells, 8–10 μm x 16–28 μm in diameter. Cortex with 1–2 layers of cells, markedly pigmented, ovoid, 4–4.5 μm x 5.4–7.5 μm in diameter. Cystocarps without constrictions at the base, 470–490 μm x 600–760 μm in diameter ( Fig. 45 ).

Figures

FIGURES 39–50. 39–41. Gracilaria cornea. 39. Habit. Scale bar = 4 cm. 40. Medullary and cortical cells. Scale bar = 250 μm. 41. Tetrasporangia in cortex. Scale bar = 30 μm. 42–43. Gracilaria flabelliformis. 42. Habit. Scale bar = 1.5 cm. 43. Medullary and cortical cells. Scale bar = 260 μm. 44–45. Gracilaria mammillaris. 44. Habit. Scale bar = 2 cm. 45. Medullary and cortical cells, and a mature cystocarp. Scale bar = 200 μm. 46–48. Gracilaria microcarpa. 46. Habit. Scale bar = 3 cm. 47. Medullary and cortical cells. Scale bar = 130 μm. 48. Mature cystocarp. Scale bar = 60 μm. 49–50. Gracilaria tikvahiae. 49. Habit. Scale bar = 2 cm. 50. Medullary and cortical cells. Scale bar = 130 μm.