Scytonema magnum 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

    Scytonemataceae

  • Scientific Name

    Scytonema magnum N.L.Gardner

  • Description

    Species Description - Filaments 400-600 µ long, 24-32 µ diam., densely interwoven, forming a flocculent stratum 1-1.5 mm. thick; trichomes 15-22 µ diam.; cells cylindrical to dolioform, subquadrate in the meristematic region, up to twice as long as the diameter in the older parts, purplish gray, mostly homogeneous; cross-walls thin but distinct; heterocysts numerous, of the same size and shape as the cells, yellowish brown; sheath thick at first, hyaline and homogeneous, becoming yellowish brown and lamellose, the lamellae not divergent, surface smooth.

    Distribution and Ecology - Growing on rocks in a brook about five kilometers north of Utuado, no. 1609, type; on rocks between Utuado and Adjuntas, no. 1661.

  • Discussion

    PLATE 16, FIGURE 31

    The material in the above-mentioned collections is well advanced in age, and the branching is very sparse, but as far as observed, the branches are geminate.