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WoRMS Photogallery » Rhodophyta (red algae)
Morphological features of Chondria tumulosa sp.nov.
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.
PNG file - 10.94 MB - 1 906 x 2 610 pixels added on 2020-07-22127 viewsWoRMS taxaDigital photo, part of species Chondria tumulosa A.R.Sherwood & J.M.Huisman, 2020checked Guiry, Michael D. 2020-07-22 Creative Commons License This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License
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