Nostoc sp. B

Mcgregor, Glenn B., 2018, Freshwater Cyanobacteria of North-Eastern Australia: 3. Nostocales, Phytotaxa 359 (1), pp. 448-450 : 448-450

Nostoc sp. B Fig. 50 A–B .

Colonies gelatinous, irregularly spherical to ellipsoidal, 1–3 mm in diameter, firm, olive-green to brownish red in colour, filaments densely entangled. Trichomes flexuous, ± indistinct sheaths, constricted at the cross walls. Vegetative cells sub-globose to barrel-shaped, isodiametric up to 2 × longer than wide, 2.8–6.2 μm long × 2.8–3.6 μm wide, pinkish red in colour. Heterocytes sub-spherical, 3.9–6.0 μm in diameter. Akinetes spherical to ellipsoidal, single or in series, 5.6–7.5 μm long × 5.0–6.0 μm wide, with smooth colourless cell wall.

Specimens examined:—Brisbane R. at Colleges Crossing.

Observations:—Attached to stones and woody debris in the littoral area of a coastal subtropical river. The brownish red colour of the vegetative cells is distinctive for this species. Compare with N. brittonii Gardner.

Other species known from Australia: N. borzioides, Limestone Gorge, Gregory Natl Park , Northern Territory, Entwisle & Skinner, 1996 ( MEL) ; N. pruniforme, Murray R., Murray Falls, Cardwell , Queensland, Entwisle , 1993 ( MEL) , Souita Falls, tributary of Beatrice R., Cardwell, Queensland, Entwisle ,1993 ( MEL) ; Rocky Springs, W of Eulo , Queensland, Ponder & Colman, 1984 ( NSW) , Ellenborough Falls, Ellenborough R., Elands, New South Wales, Entwisle , 1991 ( MEL 2046775 ) ; Little Murray R., falls below bridge, Dorrigo, New South Wales, S. Skinner, 2000 ( NSW) , Findon Ck, 8.4 km from Old Grevillia, New South Wales, Entwisle , 1997 ( MEL) , Karuah R., upper part of Chichester S.F., Barrington Tops, New South Wales, Entwisle , 1991 ( MEL) , Polblue Ck, Horse Swamp Camping Area, New South Wales, Entwisle , 1999 ( NSW) , Apsley Falls, Apsley R., Oxley Wild Rivers Natl Park, New South Wales, Skinner , 2000 ( NSW) , Bergen Op Zoom Ck, 8 km NE of Walcha, New South Wales, Skinner , 2000 ( NSW) , Surveyor Ck, Walcha Road, New South Wales, May , 1968 ( NSW A3132 ) , Chaelundi Ck, Chaelundi Rest Area, Guy Fawkes R. Natl Park, New South Wales, Skinner , 2000 ( NSW) ; Wollomombi R, bridge on Waterfall Way, New South Wales, Skinner , 2000 ( NSW) , Penrith Lakes, New South Wales, Skinner , 2000 ( NSW) , Blarney Ck, Wattagan Natl Park, New South Wales, Cherry , 2000 ( NSW) . South Coast: Chalkhills Ck, Rats Valley Rd, off Chalkhills Rd , Pambula , New South Wales, Entwisle , 1991 ( MEL) , Yowrie R., Yowrie, S. Skinner, 2000, Illawarbra Ck, Wandella S.F., Cobargo, New South Wales, Skinner, 2000, Sawpit Ck, Jindabyne-Mt. Kosciuzko Rd, New South Wales, Entwisle, 988 ( MEL) , Fiddlers Green Ck, Cann Valley Hwy, 34 km from Cann R. township, Victoria, Entwisle , 1991 ( MEL) ; N. gelatinosum, Bullock Ck , Northern Tablelands, New South Wales, Skinner , 2000 ( NSW) .

WOLLEA

Figures

FIGURE 50. A–B Nostoc sp. B; C–D Nostoc sphaericum. Scale bars = 20 μm