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Diatoms of the United States is now known as Diatoms of North America.
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GENERA starting with "l"


Lacustriella 1

  1. Valves lanceolate to elliptic
  2. Apices acute
  3. Terminal raphe fissures oppositely curved
  4. Striae end at the face-mantle junction in an elongate areola

Symmetrical biraphid - Species of Lacustriella are characterized by large valves with acute apices, uniseriate striae and terminal raphe fissures that are oppositely deflected. The valve outline ranges from lanceolate to elliptic. The raphe fissures continue onto the mantle. Striae are uniseriate and radiate, and terminate with an elongate areola. Striae do not continue on to the mantle. Lacustriella contains several taxa formerly placed in...

Lemnicola 1

  1. Apex narrowed, rounded and/or subrostrate
  2. Striae radiate
  3. Raphe valve with asymmetric stauros

Monoraphid - Valves of Lemnicola are linear to linear-elliptical. The valve apices may be narrowed, rounded, or subrostrate. The striae are slightly radial throughout and composed of biseriate rows of circular areolae. The raphe valve has an asymmetrical stauros. Lemnicola was erected for a single species, Lemnicola hungarica (Grun.) Round et Basson, which had previously been considered within Achnanthidium or Achnanthes. Living...

Lindavia 12

  1. One or more rimoportulae on valve face

Centric - Lindavia contains the taxa that were formerly included in the Cyclotella comta group, including species in the genera Puncticulata and Handmannia. One character that joins the lineage Lindavia is the presence of one or more rimoportulae on the valve face. That is, the rimoportulae are not positioned along side the marginal fultoportulae. Other characters of Lindavia include the type of satellite pores on the...

Luticola 3

  1. Valve linear-lanceolate to lanceolate with rounded, rostrate or capitate ends
  2. Stigma distinct
  3. Striae punctate
  4. Proximal raphe ends slightly deflected

Symmetrical biraphid - Valves of Luticola have an expanded central area with a distinct stigma in the central area. The striae are distinctly punctate. Proximal raphe ends are slightly deflected unilaterally. Distal raphe ends are deflected to the same side as the proximal raphe ends. Living cells possess a single chloroplast. Luticola is a widespread aerophilic genus, typical of soil and moss habitats. It includes the former Navicula mutica...