. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Freshwater Algae of Africa. 561 Long., 3^/x; lat., 26/a; lat. isthm., 12/x. All individuals triangular in end-view. 3. Staurastrum hexagonale, n. sp. ( Fig. 32.) S. subparvum, cireiter I}, plo longius quam latum, modice con- strictum, sinu acutangulo Late aperto. Semicellulae transverse hexa- gonae, angulis lateralibus leviter productis, angulis omnibus plus minus rotundatis; apicibus rectis truncatis; marginibus lateralibus superioribus fere rectis, marginibus lateralibus inferioribus reotis vel
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Freshwater Algae of Africa. 561 Long., 3^/x; lat., 26/a; lat. isthm., 12/x. All individuals triangular in end-view. 3. Staurastrum hexagonale, n. sp. ( Fig. 32.) S. subparvum, cireiter I}, plo longius quam latum, modice con- strictum, sinu acutangulo Late aperto. Semicellulae transverse hexa- gonae, angulis lateralibus leviter productis, angulis omnibus plus minus rotundatis; apicibus rectis truncatis; marginibus lateralibus superioribus fere rectis, marginibus lateralibus inferioribus reotis vel leviter concavis. A vertice visae tri- vel quadrangulares, angulis rotundatis, lateribus plus minus concavis. Membrana in parte centrali semicellularum laevis, sed angulis granulis parvis Fig. 32.—Staurastrum hexagonale, n. sp. * 7~>o. eoncentrice dispositis, munitis, iis in apice anguli utriusque paullo majoribus, plus minus acutis, etiam dentiformibus. 33-36ju.; lat., 25-30/a; lat. isthm., 10-12 fi; crass., 19-20 fi. Samples 8, 19. This species is characterised by the hexagonal shape of the semi- cells in front-view (Fig. 32). In this respect it differs markedly from the nearly allied 8. punctulatum, Breb. Other points of distinction are: (a) The more marked rounding of the ends and the concavity of the sides in end-view: (b) the absence of granules from the central part of the semicells ; (c) the tooth-like character of the granules at the ends: and (d) the proportionally greater length. In outline it bears some resemblance to S. anguloswm, Schmidt (which, however, I only know from the inadequate figures in Migula, Krypto-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum; South African Museum. Annale van die Suid-Afrikaanse Museum. Cape Town [etc. , South Afri
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
