Studies on high altitude saxicolous-Cyanophyta XI - On the morphology of Petalonema borzii sp. nov.

Non-marine algae of Australia : 2. Some conspicuous tuft-forming Cyanobacteria

“…While some specimens show similarities to Coleodesmiumopsis of Dutt et al (1982) we feel that the range of variation in our material indicates one plastic species, not two distinct genera. There is much variability in the presence and number of heterocytes in Australian collections (see Entwisle 1989), and also in the size and frequency of hormogonia.…”