The red algal genus Coelarthrum Børgesen (Rhodymeniaceae, Rhodymeniales) in Australian seas, including the description of Chamaebotrys gen. nov

Huisman, J.M. (1996) The red algal genus Coelarthrum Børgesen (Rhodymeniaceae, Rhodymeniales) in Australian seas, including the description of Chamaebotrys gen. nov. Phycologia, 35 (2). pp. 95-112.

Abstract

The genus Coelarthrum presently includes eight species world-wide, of which three (C muelleri (Sonder) Børgesen, C. cliftonii (Harvey) Kylin and C. boergesenii Weber-van Bosse) have been recorded from Australian seas. An examination of type and recent collections of these and several non-Australian species has resulted in several nomenclatural and taxonomic changes. The type of the genus, C. albertisii (Piccone) Børgesen from the Canary Islands, is considered to be conspecific with the earlier Australian taxon C. cliftonii. Coelarthrum muelleri is conspecific with the Indian Ocean taxon C. opuntia (Endlicher) Børgesen. A new species, Coelarthrum decumbens, has been recognized in collections from eastern Australia, differing in its decumbent habit and production of tetrasporangia in son. Tetrasporangial development in Coelarthrum boergesenii differs substantially from that occurring in the other species, and the genus Chamaebotrys is erected to accommodate this taxon. The new genus is vegetatively similar to Coelarthrum but tetrasporangia are terminal and produced in nemathecia, whereas in Coelarthrum the sporangia are modified intercalary cortical cells.

Item Type:	Journal Article
Murdoch Affiliation(s):	School of Biological Sciences and Biotechnology
Publisher:	International Phycological Society
URI:	http://researchrepository.murdoch.edu.au/id/eprint/11067

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