Planktolyngbya sp.
Key to Families
1. Cells growing to the original size of the mother cell before the next division.......................... 2
1: Cells not growing to the original size before division; divisions occurring in rapid succession............5
2. Trichomes fragmenting with necridia into motile hormogonia (1)............................................... PHORMIDIACEAE
2: Trichomes fragmenting usually without necridia............................................................................3
3. Trichomes with a widened sheath enveloping several to many trichomes (2:)............................ SCHIZOTRICHACEAE
3: Trichomes generally lacking a well-developed sheath, although thin delicate sheaths may be present in some genera.........4
4. Trichomes very short, usually few-celled, sometimes moniliform; cells isodiametric, broadly cylindrical to +-spherical (3:)..............BORZIACEAE
4: Trichomes usually more than a few cells long; cells cylindrical, +-isodiametric or mainly longer than wide........... PSEUDANABAENACEAE
5. Trichomes oval, arcuate or triangular in cross-section (1:)....................................... GOMONTIELLACEAE
5: Trichomes circular in cross-section......................................... OSCILLATORIACEAE
Key to genus
1. Trichomes heteropolar, always attached to the substratum at one end................... HETEROLEIBLEINIA
1: Trichomes isopolar, sometimes attached to the substratum along the length (or part) of the filament..........2
2. Trichomes regularly spirally coiled, without a sheath (1:)......... SPIRULINA
2: Trichomes straight, flexuous or variously coiled, with or without a sheath.......3
3. Trichomes planktonic, delicate; sheath extending beyond the trichome at both ends (2:)........ PLANKTOLYNGBYA
3: Trichomes benthic or metaphytic or planktonic; sheath, if present, not extending beyond the trichome at both ends.......4
4. Trichomes with or without a sheath (3:)............5
4: Trichomes always without a sheath...................6
5. Trichomes epiphytic, delicate, solitary, attached to the substratum along their entire length or with the ends free (4)...... LEIBLEINIA
5: Trichomes forming a tightly tangled mat............... LEPTOLYNGBYA
6. Cells clearly constricted at the cross-walls (4:)............7
6: Cells usually not constricted at the cross-walls...........8
7. Trichomes small, filamentous or pseudofilamentous, few-celled, arcuate or irregularly curved or coiled screw-like (6)..... ROMERIA
7: Trichomes solitary, generally straight; cells isodiametric or mainly longer than wide............. PSEUDANABAENA
8. Cells containing polar or central aerotopes (6:)............. LIMNOTHRIX
8: Cells without aerotopes.............9
9. Cell contents generally uniform, rarely with prominent granules (8:)................. JAAGINEMA
9: Cells containing large cyanophycin granules or conspicuous localised carotenoid bodies...... GEITLERINEMA
Key to Species
1. Trichomes twisted, contorted or spirally coiled.............................. 2
1: Trichomes straight and nearly so....................................................... 3
2. Trichomes loosely coiled or sigmoid, 0.8-1.2um wide, slightly constricted at the cross-walls (1).................P. microspira
2: Trichomes twisted to form loose or compact spirals or helices; 1.5-2.0um wide, not constricted at the cross-walls.............................. P. circumcreta
3. Trichomes 0.6-0.8 um wide, not constricted at the cross-walls (1:)........................ P. minor
3: Trichomes 1.1-1.5 um wide, slightly constricted at the cross-walls.......................... P. limnetica
Project
Perfect Execution
Project
A Real Success
Project
A Real Success
Project
Exceptional Achievement
