Geitlerinema (Anagnostidis & Komarek, 1988)
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publication ID |
https://doi.org/ 10.11646/phytotaxa.316.2.1 |
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persistent identifier |
https://treatment.plazi.org/id/03EE825E-FFE3-FFDE-FEC7-7C779BC6E73D |
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treatment provided by |
Felipe |
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scientific name |
Geitlerinema |
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Genus: Geitlerinema
Geitlerinema cf. calcuttense ( Figs. 3A–D View FIGURE 3 , 4A–E View FIGURE 4 )
Trichome unbranched, usually forming diffluent and membranaceous macroscopic mats covering soil substrate; trichomes always without sheaths as observed by LM ( Fig. 3A–D View FIGURE 3 ) and FESEM ( Fig. 4A–D View FIGURE 4 ), straight, more or less thin, 2–3 μm wide, uniseriate, unconstricted at the cross walls, usually narrowed and slightly bent to the ends, acuminate when older ( Figs. 3D View FIGURE 3 , 4C–E View FIGURE 4 ), intensely motile. Cells cylindrical to rectangular, later always longer than wide (up to several times), without aerotopes, end cells conical round (young) or narrowed and hooked ( Figs. 3D View FIGURE 3 , 4D View FIGURE 4 ), pointed, no calyptra ( Figs. 4A–E View FIGURE 4 ); Cell content bright blue-green. Cell division transverse to the long axis of a trichome, daughter cells grow to the original size before the next division. Reproduction by motile hormogonia, ‘S’ shaped ( Fig. 3D View FIGURE 3 ), without help of necridic cells but thickening present in mature trichome as observed by FESEM or may be for fragmentation of whole trichomes ( Figs. 4D–E View FIGURE 4 ).
Habitat: Estuarine mangrove soil.
Differentiating characters: In FESEM study ring like out growth observed at cross walls in actively growing young trichome which may be a morphological feature.
Geitlerinema cf. jasorvense ( Figs. 3E–I View FIGURE 3 ; Figs. 5A–G View FIGURE 5 )
Description: Filament not branched, forming membranaceous macroscopic mats covering the soil substrate ( Fig. 3E View FIGURE 3 ); trichomes thin, 3.5–4 μm wide, uniseriate ( Fig. 3F–I View FIGURE 3 ), slightly constricted at the crosswalls under FESEM when mature ( Figs. 5C, E View FIGURE 5 ), usually straight ( Fig. 3H View FIGURE 3 ) or slightly bent ( Figs. 3F, I View FIGURE 3 ; 5F, G View FIGURE 5 ), motile. Cells rectangular without aerotopes ( Figs. 3F–I View FIGURE 3 ), end cells round (young) or conical hooked, calyptra absent ( Figs. 5B–G View FIGURE 5 ). Cell content dark blue-green. Terminal cell hemispherically rounded to conical cap shaped bent and when mature ( Figs. 5B–G View FIGURE 5 ). Cell division transverse to the long axis of a trichome, daughter cells grow to the original size before the next division. Reproduction by fragmentation and subsequent hormogonia. No separation disc.
Habitat: Soil of alluvial plain early crust biofilm.
Differentiating characters: In actively growing young trichome ring like out growth present at cross walls may be a morphological feature as observed under FESEM. Without vacuolization; Hormogonia straight.
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