How diverse are coccoid cyanobacteria? A case study of terrestrial habitats from the Atlantic Rainforest (São Paulo, Brazil) Author Jr, Watson Arantes Gama Institute of Botany, Núcleo de Pesquisa em Ficologia, C. P. 3005, 1031 - 970 São Paulo, SP, Brazil & E-mail: watsonarantes @ gmail. com (corresponding author) Author Iv, Haywood Dail Laughinghouse Department of Biological Sciences, Smith College, Northampton, MA 01063, USA & Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA Author Sant’Anna, Célia Leite Institute of Botany, Núcleo de Pesquisa em Ficologia, C. P. 3005, 1031 - 970 São Paulo, SP, Brazil text Phytotaxa 2014 2014-09-12 178 2 61 97 http://dx.doi.org/10.11646/phytotaxa.178.2.1 journal article 10.11646/phytotaxa.178.2.1 1179-3163 5145178 Cyanostylon cf. gelatinosus Azevedo & Sant’Anna (1994a: 76) ( Fig. 6E ). Dendroid, dense gelatinous colonies, 3–30 celled, rarely more. Mucilaginous stalks tubular, round to elliptical, simple, firm, hyaline to slightly brown, conspicuous, lamellate, 3.1–7.5 µm diam. Cells spherical, 1.7–2.4 µm diam., 1–2 disposed at the stalk end. Cell content homogeneous, pale blue-green. Habitat: —Concrete wet walls. Notes: — Cyanostylon gelatinosus was described from caves at the seafront, different from the habitat where the present population was found, which is on concrete directly exposed to sunlight near the forest. Despite the habitat, they are morphologically similar, except for stalk color, which can be brown in C. cf. gelatinosus and is always hyaline in C. gelatinosus (Azevedo & Sant’Anna 1994). Studied material :— BRAZIL . São Paulo : São Luís do Paraitinga , State Park of “Serra do Mar” ( Santa Virgínia ), 23º 20’ 36” S , 45º 7’ 44” W , 24 February 2010 , W.A. Gama-Jr. (SP 401423) .