Mag. 400x
Large Stauroneis specimen (200µ L x 45µ W; L/W = 4.44). The stauros (clear, transverse band in the central area) is rectangular rather than bowtie-shaped. The striae are slightly radiate and densely packed at 12 striae per 10µ near the central region (see image 2). Proximal termini of the raphe are expanded (looking like the end of a Q-tip) and, to my wishful eye, the terminal portion of each proximal raphe is slightly deflected up, toward the top of the photos in image 1 (perpendicular to the long axis). These characteristics and the overall shape and size correspond well with the taxon, Stauroneis americana as seen here https://diatoms.org/species/stauroneis_americana.
collected ~3 days before observing
habitat: upper tide pool with rocks and lots of macroalgae
collected ~3 days before observing
habitat: upper tide pool with rocks and lots of macroalgae
in a forest stream
collected the day before
habitat: a natural pool with lots of Typha sp. and some Potamogeton crispu
collected the day before
habitat: a natural pool with lots of Typha sp. and some Potamogeton crispu
collected the day before
habitat: a natural pool with lots of Typha sp. and some Potamogeton crispu