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

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

tis montana (Lightf.) Dr, & Daily to the genus Anacystis (Drouet & Daily, Buti. Univ. Bot. Stud., 12, 1956). Occurence : a) On the wall of thermal Wenll I i Harkány ; d) West Java (Geitler & Ruttner, 1936). Genus : Aphanotheee Naegeli, 1849 Aphanothece bullosa (Menegh.) Rabenh., 1865 (Fig. 23) Microcystis bullosa Menegh., Monogr. Nostoch. Ital., 1842, p. 79, N. 6, T. X, f. 3, et 3 a, b. Aphanothece bullosa Rabenh., Fl. Europ. Alg. II, 1865, p. 65. Specimens occurring in Harkány frequently form spherical or sometimes irregularly lobate colonies. Colony gelatinous, greenish-yellow or bluish-green. Cells elongated elliptical. Measurements of specimens found by me are generally smaller than those of type. Rabenhorst describes (1. c. 1865) cell sizes 0,00014—0,0002", Geitler (1930, p. 172) records 3,5-5^ values; specimens occurring here measure 2,1 — 3,5 p, lower than those of type, but proportion of cellular length and breadth (one and a half times as long as broad) identical with measurement proportions of typical specimens. Gelatinous colony homogenous, no special sheath visible on cells. The cellular dimensions of the specimens occurring in Harkány shift, as compared to the typical measurements, toward the lower limits, indeed, they are sometimes even smaller, but the ratio of length and breadth is identical with that of the type. Occurrence : a) On the walls of the cooling basins (28—54° C) in Harkány ; b) The Zsóry bore, Mezőkövesd (Lovrekovich 1955); d) "In aquis thermalibus ad 'Battaglia'

", Italy (M e n e g h i n i 1842) ; Bukit Kili, East Sumatra (Geitlêr&Ruttner 1936) ; Toyama, Japan (Emoto&Yoneda 1942). var. maior Gei tier, 1936 Arch. f. Hydrobiol. Suppl., 14, 1936, p. 374 : Aphanothece bullosa (Menegh.) Rabenh. var. minor Geitler, Arch. f. Hydrobiol. Suppl. 12, 1933, p. 622. In the latin diagnosis published in the above passage, Geitler gives the description of the variety by the name var. minor, but this is identical with the description of var. maior published by the same author in 1936 (Arch. f. Hydrobiol. Suppl. 14, p. 374). Since the description, referable to two different names, records identical measurements, which apply, however, to much larger cells, it seems obvious that of the two names given by the author the latter one (Geitler 1936) is the more appropriate. In the thermae of Harkány, there occur, besides typical specimens, also elongated and elliptical cells, with measurements about 7 p. Before division, the cells increase to more than twice their length. These enlarged cells are enclosed by a colorless, simple, unlamellated sheath at the period of the formation of the nannocytae. Their length may at that time attain 17 fx, their breadth 14 p. In my observations, the cellular sheath will, during the formation of the nannocytae, distend like a sack in one or two places, as figured also by Geitler (1936, p. 378, f. 2). At these points, the sheath turns gelatinous and breaks open. The nannocytae leave the cell by these openings. Nannocytae form by 8 or 16 in the mother cells. The mother cells contain the nannocytae in groups of 4 to 16. and they may frequently be angularly depressed.