| | Algaebase: listing the world's algae (Site not responding. Last check: 2007-11-02) |
 | | Most species with perennial sporophytes (2-18 years old) with a blade that is regenerated from the meristematic region between blade and stipe. |
 | | Blades entire without median fascia (section: Simplices) or with conspicious median fascia (section: Fasciatae), or blades incompletely or palmately divided into a number of segments (section: Digitatae). |
 | | Sporophyte consists of different tissues: the central medulla, the parenchymatous cortex and the outer meristoderm, which is both photosynthetic and meristematic. |
| www.algaebase.org /generadetail.lasso?genus_id=3 (937 words) |