Morphological features of Chondria tumulosa sp.nov.
Description A. View of Chondria overgrowing the coral reef at Pearl and Hermes Atoll (PHA) at 12 m depth, Papahānaumokuākea Marine National Monument, Hawai‘i, USA. Scale bar = 30 cm.
B. Close view of Chondria tumulosa at PHA. Scale bar = 10 cm.
C. Macroscopic view of the edge of a mat of Chondria tumulosa, illustrating the intertwined and mat-like growth of the alga, and the color variations from yellowish to purple. Scale bar = 2 cm.
D. Close up view of several main axes that were separated from the upper surface of a mat, illustrating the numerous secondary and tertiary branches from the main axis. Scale bar = 5 mm.
E. Close up view of several main axes that were separated from the lower surface of a mat, illustrating the darker color and slender haptera (arrow) used for attachment of the mat to the substratum. Scale bar = 5 mm.
F. A branch apex, focused internally to illustrate the apical depression, or pit. Scale bar = 50 μm.
G. A branch tip, focused to illustrate trichoblasts emerging from the pit. Scale bar = 50 μm.
H. Cross section of Chondria tumulosa stained with ruthenium red, demonstrating the typical rhodomelacean structure, with a central axial cell (a) surrounded by five pericentral cells (p). Cell wall thickenings are indicated in some cells (arrows) outside of this central structure. Scale bar = 50 μm.
I. Surface view of cortical cells in the epidermal layer. Scale bar = 50 μm.
J. Tetrasporangia developing towards the apices of secondary and tertiary axes. Scale bar = 200 μm.
K. Close-up of a tetrahedrally divided tetrasporangium, stained with aniline blue.
Scale bar = 100 μm. https://doi.org/10.1371/journal.pone.0234358.g004 PNG file - 10.94 MB - 1 906 x 2 610 pixelsadded on 2020-07-22127 viewsWoRMS taxaDigital photo, part of speciesChondria tumulosa A.R.Sherwood & J.M.Huisman, 2020checked Guiry, Michael D. 2020-07-22 This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License
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