Acta Botanica Croatica, Vol. 4 No. 1, 1929.
Izvorni znanstveni članak
Contribution to flora of freshwateralgae of the Croatian Island Krk
Ivo Pevalek
; Hrvatska
Sažetak
The Island of Krk, situated close to the northern shores of the Croatian Littoral, has, with respect to the knowledge of its freshwater flora of algae, up to recent times been nearly unexplored, although its hydrographic vascular flora is fairly well known. The author has gathered algae in three1 places (Ponikva, Niivice, Jezero), where he was able to determine 73 species, of which, against all expectation, more than one half was formed by the Desmidiaceae. Among these the following new forms have been found:
Cosmarium Miinster-Strdmii nov. spec.
Tb. I. f. 3. a. and b.
Cells subsemicircuiar in outline, deeply constricted, breadth exceeding length.
Margin of semicells undulatae.
Semicells broadly subsemicircuiar - subpyramidate, apex broadly truncate, basal angles rounded, sides sligtly convex 3-crenate. Apex 4-crenulate.
Vertical view narrowly elliptic, with 3 protuberances at the middle on each side.
Side view of semicells subcircular.
Cell-wall punctate.
Chloroplasts axile, each with one pyrenoid.
Length 24—24.2,«; breadth 25 u; breadth of isthmus 5.6—6 /«; thickness 12/«; breadth of apex 10/«.
Niivice.
Cosmarium blanjinense nov. spec.
Tb. I. f. 7.
Cells semicircular in outline, deeply constricted, about 1.37 times longer as broad.
Margin of semicells undulate, with 12 undulations; lateral undulations 4 equal. Apical undulations two by two a little smaller.
Vertical view of semicells elliptic, ratio of axes 1 : 1.3.
Side view of semicells subcircular.
Cell-wall smooth.
Chloroplasts axile, each with one pyreuoid.
Length 23—23.4,«; breadth 17,«; breadth of isthmus 4.6—4.7,«; thickness 12 ,«.
Blanjina.
Cosmarium krkense nov. spec.
Tb. I. f. 5.
Cells more long than broad, very deeply constricted, sinus widely open.
Semicells semielliptical, lower part of lateral margins convex, apex convex, angles produced into stout rounded mamillae.
Vertical view rliomboidal-elliptic with sides little concave. Ratio of axes 1 : 1.63 — 1.76.
Cell-wall punctate.
Length 18.2,«; breadth 15.6—18.8,«; breadth of isthmus 6.5 ,«; thickness 10.4 ,«.
Njivice.
Cosmarium vexatum West var. illyricum nov. var.
Tb. I. f. 6.
Cells 1.1—1.2 more long than broad.
Semicells with sides convex in basal part with 4—5 equal granules. Upper part of sides with 4—5 undulations gradually increasing in size to the upper angle.
Apex truncate, slightly subundulate (with 6 undulations).
Within the margin granulate, granules rather sparse, sub- concentrically and subradialy arranged. Central area with 5 granules.
Side and vertical views as of the C. vexatum.
Length 42—44,«; breadth 37—38,« ; breadth of apex 13—15 ,«; breadth of isthmus 10—12,«; thickness 21,«.
Pcnikva. Blanjina.
Staurastrum croaticum nov. spec.
Tb. I. f. 2.
Cells minute, with open sinus.
Semicells subquadrate with straight apex, upper angles produced to form long, diverging processes, gradually attenuated towards their apices, and with 7 undulations; apex of processes with 3 teeth.
Vertical view triangular, sides biundulates, angles produced to form long processes.
Cell-wall smooth.
Length, without processes 10.6 with processes 18—19 breadth, without processes 6.2 ft, with processes 26 — 30/t;. breadth of isthmus 4.7— 5Aft.
Njivice.
Staurastrum krkense nov. spec.
Tb. 1. f. 8.
Cells constricted, sinus acute, open.
Semicells cup-shaped, ventral margin tumid, dorsal margin very convex and undulate, angles produced to form long converging processes, gradually tapering towards their apices with 7 undulations; apex of processes with 3 teeth.
Vertical view assymetrical-triangular with two concave and one convex side; angles produced in to long processes. Processes diverging with angles cc. 146°, 104° and 110°.
Length with processes 21 — 36 breadth with processes 23 — 36 u; breadth of isthmus 5.4 /t.
Njivice.
Krkia nov. gen.
Colonies spherical, mucous, solid, free-swimming with 2 — 24 cells; rare cells either single.
Cells club-shaped.
Reproduction by endospors and longitudinal division.
Krkia croatica nov. spec.
Fig. 1.
Cells 7 — 8 ft in length, 0.8—1.75 /
Cell contents homogeneous, very blue green.
Njivice.
It is interesting to emphasize, that all the three places, examined as to their algae, considerably and essentially differ from each other in their algae and that they possess comparatively many new endemic forms. This fact goes to prove that these places, with respect to their flora of freshwater algae, if compared with other places of the continental carst-rocks, must be very old.
Ključne riječi
Hrčak ID:
151913
URI
Datum izdavanja:
31.12.1929.
Posjeta: 999 *