A new aerial alga, Stichococcus ampulliformis sp. nov. (Trebouxiophyceae, Chlorophyta) from Japan

• DOI: 10.1111/j.1440-1835.2003.tb00188.x
• Publication Date: 2006-02-22T10:48:27Z
• Authors: Shinji Handa; Miho Nakahara; Hiromi Tsubota; Hironori Deguchi; Taketo Nakano
• Keywords: 0303 health sciences; 03 medical and health sciences

SUMMARY A new aerial alga, Stichococcus ampulliformis S. Handa sp. nov. (Trebouxiophyceae, Chlorophyta) is described based on a clone isolated from the bark of Cephalotaxus harringtonia (Knight ex Forbes) K. Koch collected from Taishaku-kyo Gorge, Hiroshima Prefecture, south-west Japan. This alga was examined by light microscopy and transmission electron microscopy and subjected to molecular phylogenetic analysis. Based on its morphological features and life-cycle, especially short filament formation, the alga was assigned to the genus Stichococcus Nageli. However, this alga differs from other described Stichococcus species in that it reproduces by a form of ‘budding’, producing two daughter cells of different sizes. The larger cell, enclosed within the mother cell wall, soon reaches the size of a normal vegetative cell. The smaller cell is extruded and takes longer to reach full vegetative size. A phylogenetic tree constructed using 18S rRNA sequences indicated that, within the Trebouxiophyceae, S. ampulliformis is closely related to S. bacillaris Nageli and some species of Prasiola Meneghini.