Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 8. (Budapest 1957)

Kol, E.: On the snow vegetation of the Grecian Mountains

the separation of the several species will probably be possible by cultures only. In the examined snow samples, I have found only the resting stage, the globular cells of 9—15 p. diameters of this alga, the same as in the snow samples collected in Bulgaria. Figure 20. shows a cell of 15 p diarn. wrapped in a thick mucilage envelope ; I have seen only some few pieces of it. The 15 /i diameter Zygospore is smaller than the one described by Wille; it has the same size as the one living on the snow of the Bulgarian mountains (K o 1, 1956). Even the ribbing of the cell wall of the Zygospore (Fig. 17) displays differences when compared with the drawing of Wille (Pascher, H. 4. p. 198, Fig. 137). It is highly possible that we have to deal also in this case with an endemic Balkanian form of Chlamydomonas nivalis. This suggestion will, however, be validated and wholly cleared by the examination of living material only. Cystococcus nivicolus Kol (Fig. 7 — 9). I have described this alga from the yellow snow of the Bükk Mountains in Hungary (Kol, 1955), where, in the case of large quantities, it causes a butter-yellow discoloration of the snow surface . The globular cells have a diameter of 12—21 p, the autosporangium being of 21 p diameter (Fig. 8). In these snow samples, most of the cells found belonged to Chlamydomonas nivalis, Scotiella nivalis and Cystococcus nivicolus (Table 1). It is also frequent on the snow patches of the mountains of Bulgaria. Gloeotila protogenita Kg. (Fig. 1.). The filaments found in the snow samples of the Taygetos are 2,5 — 3 p broad. Accordingly, they are much narrower than the plant described by K ü t z i n g ; even so, I regard it as belonging to this species and is a narrower form of it. They are enveloped in a thick mucilage sheath. W i 11 r o c k mentions Gloeotila mucosa from the snow of Greenland ; there is a high probability that we are confronted in both cases by a nivicolous form of Gloeotila protogenita. Scotiella antarctica F. E. Fritsch (Fig. 18, 19). I found two different stages of this alga in the snow samples of the Smolika which I have also seen in the snow samples of the Bulgarian mountains. There is a smooth, elliptical cell, 38 p broad, 45 p long (Fig. 19), and another elliptical cell with weakly undulating cell-wall, 35 p broad, 45 p long (Fig. 18) ; both are probably different developmental stages of Scotiella antarctica. This species was also found in the mountains of Bulgaria. Scotiella nivalis (Chodat) Fritsch (Fig. 2—4.). The cells are 6—10 p broad, 10—29 fi long; I found various developmental stages (Table 1).