2006-08-21 22:46:23 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Phormidium usually forms flat, slimy mats of tangled filaments, and is similar in morphology to Lyngbya and Oscillatoria. However, Phormidium mats do not dissociate as easily as those of Oscillatoria, and the sheaths on Phormidium filaments are looser than the rigid sheaths of Lyngbya. The mats are usually attached to benthic substrates, and can detach and float to the surface. Occasionally, the filaments may be solitary or arranged in tufts.
The filaments are long, cylindrical, and may be curved or spiralled. Thin, firm, colorless sheaths adhere closely to the trichomes. The filaments move by gliding, creeping, rotating, or oscillating both inside and outside of the sheaths. The cells are rectangular and have unconstricted or slightly constricted cross walls. The apical cells may have calyptra, and are more pointed, narrow, or rounded than the other cells. Usually, the thylakoids are arranged radially within the cell, creating a net-like or banded appearance. Gas vesicles are not present
2006-08-21 22:52:54 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Phormidium usually forms flat, slimy mats of tangled filaments, and is similar in morphology to Lyngbya and Oscillatoria. However, Phormidium mats do not dissociate as easily as those of Oscillatoria, and the sheaths on Phormidium filaments are looser than the rigid sheaths of Lyngbya. The mats are usually attached to benthic substrates, and can detach and float to the surface. Occasionally, the filaments may be solitary or arranged in tufts.
The filaments are long, cylindrical, and may be curved or spiralled. Thin, firm, colorless sheaths adhere closely to the trichomes. The filaments move by gliding, creeping, rotating, or oscillating both inside and outside of the sheaths. The cells are rectangular and have unconstricted or slightly constricted cross walls. The apical cells may have calyptra, and are more pointed, narrow, or rounded than the other cells. Usually, the thylakoids are arranged radially within the cell, creating a net-like or banded appearance. Gas vesicles are not present
2006-08-22 09:10:56 · answer #2 · answered by cookie 2 · 0⤊ 0⤋
Phormidium is a genus of blue-green algae.
2006-08-22 06:06:01 · answer #3 · answered by DKS 2 · 1⤊ 0⤋
http://silicasecchidisk.conncoll.edu/LucidKeys/Carolina_Key/html/Phormidium_Main.html
2006-08-22 05:51:44 · answer #4 · answered by Anonymous · 0⤊ 0⤋