Hyella cf. caespitosa var. arbuscula Al-Thukair & Golubić (1996: 84)

Jr, Watson Arantes Gama, Iv, Haywood Dail Laughinghouse & Sant’Anna, Célia Leite, 2014, How diverse are coccoid cyanobacteria? A case study of terrestrial habitats from the Atlantic Rainforest (São Paulo, Brazil), Phytotaxa 178 (2), pp. 61-97 : 89

Hyella cf. caespitosa var. arbuscula Al-Thukair & Golubić (1996: 84) ( Figs. 14C–14D ).

Main thallus with polygonal cells, 4.4–5.2 µm diam. Pseudofilaments radiating into substrate, 30.8–78.0 µm length, branched, uniseriate. Sheath firm, hyaline, conspicuous, non-lamellate, smooth. Middle cells of pseudofilaments quadratic to rectangular, 1.9–3.6 × 3.3–9.0 µm. Apical cells of pseudofilaments tortuous, round ends, 1.9–2.8 × 10.6– 17.0 µm. Baeocytes produced by the main thallus, more than 20 per cell, 1.2–1.6 µm diam. Cell content homogenous, rosy to purple-brown.

Habitat: —Rocks in tidal zone.

Notes: —The habitat and morphology of the colonies and cells of the Brazilian population are similar to those described for Hyella caespitosa var. arbuscula Al-Thukair & Golubić (1996: 84) . However, the dimensions of all structures were smaller.

Studied material: — BRAZIL. São Paulo: Peruíbe, Ecological Station “Juréia-Itatins”, 24° 23.368’ S, 47° 0.671’ W, 16 August 2011, W.A. Gama-Jr., G.S. Hentschke, C.F.S. Malone & C.L. Sant’Anna (SP 427318) .

Figures

FIGURES 14A–14B. Chamaesiphon stratosus. Cell arrangement and initial stage after exospore germination (arrow). FIGURES 14C–14D. Hyella cf. caespitosa var. arbuscula. General thallus aspect and detail of baeocytes in mothers’ sheath (arrow).