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

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

Fam. : CHROOCOCCIDIACEAE Genus : Myxosarcina Printz, 1921 Myxosarcina spectabilis Geitler, 1933 (Fig. 10) Arch. f. Hydrobiol., Suppl., 12, 1933, p. 625 ; Suppl., 14, 1936, p. 391, F. 12, 17. Cells of specimens occurring in Harkány spherical or almost spherical, enveloped by closely adherent, colorless, thin membrane. Cells transforming into sporangia by division, mature sporangium about 8,4 LI in diameter, endospores 3,5—4,2 LI, enclosing themselves in membrane, then 4,9 LI in diameter when walls of mother cells grow mucous and disrupt, freed endospores constitute new cell groups. Sometimes plasma dividing within sporangium disintegrates into parts of unequal sizes. Drouet&Daily (Butl. Univ. Bot. Stud., 12, 1956, p. 51) relegate it to Anacystis montana (Lightf.) Dr. & Daily. Occurrence : a) In gelatinous cover on the walls of the spring wells and the thermal cooling sinks in Harkány; d) The Kadyay hot springs in Sumatra (Geitler&Ruttner 1936); Hokkaido, Japan (Y o n e d a 1940). Genus : Chroococcidium Geitler, 1933 Chroococcidium gelatinosum Geitler, 1933 Arch. f. Hydrobiol., Suppl., 14, 1933, p. 627 ; Arch. f. Hydrobiol., Suppl., 14, 1936, p. 387, fig. 12, 13. Sizes, shapes and formation of endospores of specimens occurring in Harkány agree with description of type. Cells chroococcus-like, furnished by individual envelopes, loosely arranged in common gelatinous integument. Integument surrounding cells not or very little lamellated, and tending to grow mucous. Beside cell division, also endospore formation observable. Endospores form by 8 or 16, three-dimensionally within mother cell wall. Endospores 6—10 LI in diameter ; cells liberated by mucosity of mother cell wall form partial colonies by congregating in twos or fours. Occurrence: a) On the walls of the spring wells and the cooling basins ; d) Sumatra (Geitler&Ruttner 1936). Cbroococcidiopsis thermalis Geitler, 1933 (Fig. 6—7) Geitler, Arch. f. Hydrobiol., Suppl., 12, 1933, p. 625 ; Arch. f. Hydrobiol., Suppl. 14, 1936, p. 391, f. 12, 17. Specimens occurring in Harkány spherical or almost spherical, surrounded by colorless, closely adherent membrane. When dividing, cells transform into sporangia ; mature sporangium about 8,4 LI in diameter, endospores 3,5—4,2 LI, enclosing themselves by membrane, then 4,9 LI in diameter ; after having surrounded themselves with membrane, endospores escape through mucous, disrupting wall of mother cell wall, forming new cell groups. Sometimes plasma dividing within sporangium disintegrates into portions of unequal size. Species forms microscopic crust on other filamentous Cyanophyton taxa. Drouet&Daily (Butl. Univ. Bot. Stud., 12, 1956, p. 51) relegate the species to Anacystis montana (Lightf.) Dr. & Daily. Occurrence : a) As gelatinous cover on walls of thermal spring wells and cooling basins in Harkány ; d) In hot springs of Kadyay ; Sumatra (Geitler&Ruttner 1936) ; Hokkaido, Japan (Y o n e d a 1940).