Diatoms of North AmericaDiatoms of North America
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Compare Platessa hustedtii

(Krasske) Lange-Bert. in Krammer and Lange-Bert. 2004

Compare

Psammothidium acidoclinatum and P. daonense have more narrow striae and a higher stria density. Platessa rupestris has more lanceolate valves, and the raphe valve has a wider axial area and wider central area. Platessa montana has rhomboid-elliptic valves and a higher stria density. Rapheless valves of P. hustedtii and Achnanthes lutheri can easily be confused, but A. lutheri is distinguished by higher stria density on the raphe valve.

LM scalebar = 10 µm
Platessa hustedtii LM4 Platessa hustedtii LM3 Platessa hustedtii LM1 Platessa hustedtii LM2 Gs027063 Plhust1 De000026 1 Gc44474 Rup1
Length Range
11-15 µm
Width Range
5.0-6.4 µm
Striae in 10 µm
15-18

Psammothidium acidoclinatum

(Lange-Bert.) Lange-Bert. 1996

Psammothidium acidoclinatum LM5 Psammothidium acidoclinatum LM4 Psammothidium acidoclinatum LM3 Psammothidium acidoclinatum LM2 Psammothidium acidoclinatum LM1
Length Range
8-16 µm
Width Range
4.4-5.8 µm
Striae in 10 µm
23-27

Psammothidium daonense

(Lange-Bert.) Lange-Bert. 1999

Psammothidium daonense LM3 Psammothidium daonense LM2 Psammothidium daonense LM1 Gs100739 Psdao 4A Ed Gs100739 Psdao 4B Ed Mo000019 1A Ed Gs007601 Psdao 1A Ed
Length Range
9-23 µm
Width Range
4.8-7.5 µm
Striae in 10 µm
24-30

Also compare to

Platessa montana

(Krasske) Lange-Bert. in Krammer and Lange-Bert.

Platessa rupestris

(Krasske) Lange-Bert. in Krammer and Lange-Bert.

Achnanthes lutheri

Hust.