Bacillariales

Fig 1: Schematic drawing of Pseudo-nitzschia pungens showing two closely packed rows of poroids.

Fig 1: Pseudonitzschia multiseries Schematic drawing of the cell with detailed arrangement in the valve view.

Fig 2: Pseudonitzschia multiseries Scanned electron micrograph showing detail of the stria, poroids and fibulae.

Fig 3: Pseudonitzschia multiseries Scanned electron micrograph image showing detailed stria, fibulae and poroids.

Fig 4: Pseudonitzschia multiseries Scanned electron micrograph image showing detail of the stria.

Fig 1: Schematic drawing of the cell in the valve view.

Fig 2: Electron micrograph image showing detail of the striae and fibulae

Fig 3: Electron micrograph image of the valve end showing detail of the poroids, fibulae and striae.

Fig 4: Electron micrograph image showing detail of the striae.

An image of Nitzschia sigmoidea taken with an electron microscope.

4648a

TEM of cleaned P. calliantha frustules. Note the long, thin valves and the central nodule.

Nitzschia sigmoidea

Valve view of P. calliantha, note the diagnostic flower pattern in the poroid hymen

Nitzschia sigmoidea

Nitzschia sigmoidea