Myriocladia lovenii J.Agardh (BC/A)

This species forms gooey light to dark brown fuzzy thalli, sparsely to abundantly branched, and from 4-16 cm tall (Image A). Squash mount near the tips reveals a central axial filament coated with lateral cells as well as numerous rhizoidal cells, all of the outer cells of which can produce branched assimilatory filaments (Image B). Material did not rehydrate well, but a partial long section reveals the primary axial filament, its lateral cells and adjacent primary cells, all of which can produce ascending and descending rhizoids (Image C). Assimilatory filaments are typically > 8 cells in length and branched between 2-5 cells from the base, at which level hairs and unilocular sporangia are also produced (Image D). Hairs have a clear meristematic zone near their base (Image E). Although tentative, an image of the forked terminal filament found at the apices of the indeterminate axes, as is characteristic of this species, was possibly observed (Image F). The assimilatory filaments are produced from both the primary vegetative cells and the surface cells of the thick rhizoidal investment around the central filament. Unilocular sporangia are typically oval, 26-38 µm wide by 53-60 µm long (Image G).

We have only four genetically verified collections, three from BC (Tahsis on the west coast of Vancouver Island and Rennell Sound on Haida Gwaii) and one from Bonne Bay, NL. All collections were from the subtidal (5-7 m) on rock. As is typical of Chordariaceae, the material did not rehydrate well and the details were difficult to discern. This page will be updated when we acquire fresh material.

Image A. Pressed voucher of Myriocladia lovenii J.Agardh from subtidal (5 m) on rock at Eisenia Pt. (south of Riley Beach), Rennell Sound, Haida Gwaii, BC (GWS036899).

Image B. Squash mount near the tip of an indeterminate axis with the central filament visible through the coating of rhizoidal development, as well as the characteristic assimilatory filaments (GWS036899; rehydrated, aniline blue stained).

Image C. Squash long view revealing the central axial filament (A), lateral cells (L), basal cell of an assimilatory filament branch (B), and rhizoids (R) ascending and descending from the various primary vegetative cells (GWS036899; rehydrated, aniline blue stained).

Image D. Branched assimilatory filament with unilocular sporangium and a hair (arrow) (GWS036899; rehydrated, aniline blue stained).

Image E. Stacked cells at the basal meristematic region (arrow) of a hair (GWS036899; rehydrated, aniline blue stained).

Image F. Putative terminal forked filament (arrow) as is characteristic of this species (GWS036899; rehydrated, aniline blue stained).

Image G. Unilocular sporangia produced on the lower-mid assimilatory filament cells (GWS036899; rehydrated, aniline blue stained).