Monographs Details: Lyngbyopsis
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Description:Species Description - Filaments prostrate, composed of one or more multicellular trichomes, each developing its individual sheath; false branching in either or in both directions towards the ends of the longitudinal axis; sheath firm and membranaceous.
Discussion:The genus Lyngbyopsis, as proposed here, seems most closely related to the genus Hyphcothrix. It is to be distinguished by its method of branching combined with the character of the sheath. In HypJieothrix and closely related genera, the plants are, as a rule, oriented into a basal and an apical part. In this respect Lyngbyopsis is more closely related to such genera as Lyngbya and Phormidium, in which the trichomes are not oriented into apical and basal portions, the whole trichome being meristematic. The multiplication of trichomes within a sheath is brought about in Lyngbyopsis by the formation of hormogonia as in Lyngbya and in related genera by the death of certain cells. Upon elongation of the hormogonia in both directions the ends meet, and, instead of the sheath dissolving and liberating the trichomes, it remains intact; and, instead of the ends of the trichomes, or hormogonia, crawling or pushing each other out of the sheath, the sheath seemingly stretches and encloses them both. Repetition of the process in the same part of the filament results, at times, in several trichomes being enclosed within the same sheaths; sooner or later one or more trichomes break through the sheath, forming a false branch. Either or both ends of a trichome may push through the sheath, so that the branches may arise anywhere along the filament, and extend in opposite directions. The branches, while yet attached to the parent filament, repeat the process, resulting in a tangle of several generations of attached filaments. But a single species appears in Wille's collections and I am dedicating that to him.