Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 53. (Budapest 1961)

Halász, M.: The microvegetation of the acrothermae of Harkány

Genus : Gloeocapsa Kütz., 1843 Gloeocapsa dermochroa Naeg., 1849 (Fig. 9) Gatt, einzell. Algen, 1849, p. 51, T. I, f. 6. Specimens occurring in Harkány agree with dimeneions of type. Cells without sheaths 1,4—2,1 — 2,8 p, attaining 8 p with sheath. Width of sheath agrees with that of type. The specimens in Harkány differ from the type and the description of Hansgirg in the color of the sheath. Rabenhorst (Fl. Europ. Alg., 1865, p. 45) records a dark, brownish-black, gelatinous sheath ; while, according to Hansgirg v

Prodr., 1892, p. 151), the vegetative cells are seemingly colorless, with a yellowish sheath, the families being surrounded by a brownishyelloAV integument of colorless external layer. Geitler (1930, p. 194) records bluish-green cells with a yellowish-brown sheath. The cell families observed by me form colonies of dark brown to violet grey color, that is, the violet-grey color is also frequent beside the brown hue. The violet color of the sheath, at identical cell sizes, is characteristical of the species Gloeocapsa compacta Kütz. (Tab. Phyc, 1845—49, T. 36, f. 4). Maybe we have to do with the same Gloeocapsa species, since, in the genus Gloeocapsa, the color of the sheath varies and the colorless sheath may also become pigmented Geitler 1936, p. 99). G. dermochroa Naeg. differs also in the color of the sheath from G. punctata Naeg., agreeing with it in the dimensions and the shape of the cells, but the cellular sheaths is colorless in G. punctata, and its colonies are a dingy grey. On the basis of these coincidences, and disregarding the different coloration of the cellular sheaths, Ercegovic unites Gloeocapsa dermochroa Naeg. and Gloeocapsa punctata Naeg. in Gloeocapsa biformis Erceg. (Acta Bot. Inst. Bot. R. Univ. Zagreb, 1, 1925, p. 80). Geitler, however, separates the two species again, and also Gollerbach (1953, p. 99) discusses them separately. According to Drouet&Daily (Butl. Univ. Bot. Stud., 12, 1956), G. punctata and G. dermochroa are two distinct species, of which G. punctata Naeg. belongs to Anacystis montana Dr. & Dailv f. montana, while G. dermochroa Naeg. must be drawn under Entophysalis rivularis Dr. & Daily (Amer. Midi. Nat., 30, 1943, p. 671). Occurrence : a

) On the walls of Spring Wells I and II (as dark, brownish, gelatinous colonies), and on the walls of the cooling basins in Harkány ; b) Hajdúszoboszló (K o 1 1932) ; d) W. Java, Kuripan (Geitler&Ruttner 1936), listing the occerrence of G. alpina (Naeg.) em. Brand from the same locality (1. c. p. 376) ; Yellowstone Park, N. America (Copeland 1936) ; Beppu, etc., Japan (Y o n e d a 1938—42). The species was, according to literature data, unknown from thermae for a long time, even Geitler (p. 194) mentions it from wet rocks only as recently as 1930. Gloeocapsa gelatinosa Kütz., 1843 (Fig. 11) Phyc. gener., 1843, p. 174 ; Tab. Phyc., 1, T. 20, f. 6b. Cells occurring in Harkány about 2,5 p in diameter without sheath, 8,4—9 p with sheath ; sometimes larger cells occur too (3,5—4,5 p). Sheath surrounding cell colorless, but also brownish, or violet-brownish. — Literature mentions generally colorless sheaths only (Rabenh. 1865, p. 39, F o r t i 1907, p. 54, Tilden 1910, p. 18, Geitler 1930, p. 187), but Ruttn e r found some colonies with a brownish sheath in Kuripan, West Java (G eitler&Ruttn e r 1936, p. 377). In this respect, Geitler notes (1. c.) that one nmst be