|Recent additions to the subfamily Ceramioideae (Rhodophyta) and the nature of the ceramialean ancestor|
Athanasiadis, A. (2002). Recent additions to the subfamily Ceramioideae (Rhodophyta) and the nature of the ceramialean ancestor. Constancea 83: [no pag.]
In: Constancea: University of California Electronic Publications in Botany. University of California: Berkeley, more
The genus Inkyuleea Choi, Kraft, & Saunders (2000) previously tentatively included in the Ceramiales is here referred to the Ceramioideae on the basis of ceramialean post-fertilization stages and presence of whorl-branches on the vegetative thallus. The genus Irtugovia Perestenko (1994) originally created for three North Pacific species of Antithamnionella with distichous thallus ramification is cladistically supported, but should be expanded to include Antithamnionella floccosa, A. nigricans, and A. alternans. Irtugovia is, however, antedated by Haplocladium Nägeli (1862) and usage of the former name requires its conservation. The genus Liagorothamnion Huisman, Ballantine & Wynne (2000) originally considered to be closely related to the Dohrnielleae is excluded from the Ceramioideae and the Ceramiales, since the type species L. mucoides lacks essential ceramialean features such as procarps, auxiliary cells, and connecting cells, and possesses connecting (2-celled) filaments and nutritive cells issued from hypogynous cells. A cladistic analysis of six primitive ceramiaceous genera indicates that the ceramialean ancestor was probably similar to Warrenia, exhibiting a bilaterally ramified thallus with lateral filaments of unlimited (or latent) growth, transverse apical divisions, gland cells, carpogonial branches borne on intercalary axial cells, procarpic post-fertilization stages, and tetrasporophytes with cruciately-decussately divided tetrasporangia.