Monographs Details: Anabaena lutea N.L.Gardner
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Family:Nostocaceae
Description:Species Description - Trichomes densely aggregated, moderately straight, 4.8-5.2 µ diam., deeply constricted; cells subcylindrical to dolioform, about 2 times as long as the diameter, homogeneous, pale drab to amber-colored, forming microscopic colonies irregular in shape and size, but mostly membranaceous; heterocysts spherical, subspherical to dolioform; 6.5-7.5 µ diam; spores dolioform to broadly ellipsoidal, 7-8 µ diam., 12-15 µ long, wall smooth, 10-15-catenate; tegument yellowish or amber-colored at maturity, moderately firm.

Distribution and Ecology - Growing on earth about five kilometers south of Adjuntas, no. 1665, type; in a small stream about five kilometers east of Coamo, no. 237 c.

Discussion:

PLATE 12, FIGURE 7

It is somewhat difficult to determine the generic position of the organisms described above. It is not unlike some of the more or less foliaceous species of Nostoc, forming colonies with a definite outline. The trichomes are relatively straight and short, and the gelatinous matrix is not very firm, conditions commonly met with in Anabaena. Knowledge of the developmental stages may shed light upon the subject of its generic position. It belongs to the Dolicliospermum section of the genus, having affinities with A. inaequalis (Kuetz.) Born. & Flah. It differs from that species in being smaller in all of its measurements.