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NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 275
tached to the shell as well, including a small tuft of Ulva. This character
and its loosely attached habit with tendency to ascend and form free parts
make this plant distinct from any others known.
Genus LITHOLEPIS Foslie
Litholepis sonorensis sp. nov.
Plate 63, Fig. 1
Frondes monostromaticae, superpositae usque ad 4-stratosae, crustam continu-
am, arete ad substratum adhaerentem ad superficies totas concharum magnarum
duratarum tegentem, obscure cinereo-albae formante; cellulis magnitudine variabilis, plerumque recto elongatis, 13-25 u. altis; conceptaculis tetrasporangiiferis
humilibus, conicis, poro singulo, circa 400 u, in diam. externe, 175 u, altis, cavitate
interna 300 u, in diam., disco piano, parietibus supernis crassioribus (circa 3-
stratosis) porum circumferentibus; tetrasporangiis circa 50 \i altis, discum circum-
vallentibus.
Thalli monostromatic, growing superposed over one another, to 2-4
layers, forming a continuous, closely adherent crust over all the surfaces
of large, weathered shells, dull gray-white in color; cells variable in size,
mostly elongated slightly vertically, 13-25 p high; tetrasporangial conceptacles low, conical, with a single pore, about 400 ft external diam., 175
ft high; internal cavity 300 p diam., with a flat disk, the upper wall
thickest (about 3 layers) around pore; tetrasporangia about 50 ft long,
arising from the periphery of the disk.
Type: D. 592x, growing on a large weathered shell, dredged in
San Lorenzo Channel, Espiritu Santo Island, Feb. 14, 1940. Herb. AHF
no. 27.
No species of this genus has been described from the Pacific American
coasts. The large size of the thin, superposed crusts of this species, completely covering extensive surfaces, seems to be a character distinguishing
it from the several known in Atlantic waters. More complete collections
will be necessary, however, to verify this. The described species have not
been illustrated, and it is difficult to compare habit characters from the
existing descriptions.
Genus GORALLINA (Tournef.) Lamouroux
Corallina pilulifera Post. & Rupr.
Postels & Ruprecht, 1840, p. 20, tab. XL, fig. 101; Yendo, 1902a, p. 30,
pl. Ill, figs. 14-16, pl. VII, figs. 14-16.
Our plants correspond most closely to form sororia of Ruprecht. It is
a common middle and lower littoral species in the rock-cover vegetation
of the northern Gulf and is abundant in many tidal pools.
Object Description
Description
| Title | AHF-PUB-PE-03-10~093 |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-03-10~093.tiff |
| Full text | NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 275 tached to the shell as well, including a small tuft of Ulva. This character and its loosely attached habit with tendency to ascend and form free parts make this plant distinct from any others known. Genus LITHOLEPIS Foslie Litholepis sonorensis sp. nov. Plate 63, Fig. 1 Frondes monostromaticae, superpositae usque ad 4-stratosae, crustam continu- am, arete ad substratum adhaerentem ad superficies totas concharum magnarum duratarum tegentem, obscure cinereo-albae formante; cellulis magnitudine variabilis, plerumque recto elongatis, 13-25 u. altis; conceptaculis tetrasporangiiferis humilibus, conicis, poro singulo, circa 400 u, in diam. externe, 175 u, altis, cavitate interna 300 u, in diam., disco piano, parietibus supernis crassioribus (circa 3- stratosis) porum circumferentibus; tetrasporangiis circa 50 \i altis, discum circum- vallentibus. Thalli monostromatic, growing superposed over one another, to 2-4 layers, forming a continuous, closely adherent crust over all the surfaces of large, weathered shells, dull gray-white in color; cells variable in size, mostly elongated slightly vertically, 13-25 p high; tetrasporangial conceptacles low, conical, with a single pore, about 400 ft external diam., 175 ft high; internal cavity 300 p diam., with a flat disk, the upper wall thickest (about 3 layers) around pore; tetrasporangia about 50 ft long, arising from the periphery of the disk. Type: D. 592x, growing on a large weathered shell, dredged in San Lorenzo Channel, Espiritu Santo Island, Feb. 14, 1940. Herb. AHF no. 27. No species of this genus has been described from the Pacific American coasts. The large size of the thin, superposed crusts of this species, completely covering extensive surfaces, seems to be a character distinguishing it from the several known in Atlantic waters. More complete collections will be necessary, however, to verify this. The described species have not been illustrated, and it is difficult to compare habit characters from the existing descriptions. Genus GORALLINA (Tournef.) Lamouroux Corallina pilulifera Post. & Rupr. Postels & Ruprecht, 1840, p. 20, tab. XL, fig. 101; Yendo, 1902a, p. 30, pl. Ill, figs. 14-16, pl. VII, figs. 14-16. Our plants correspond most closely to form sororia of Ruprecht. It is a common middle and lower littoral species in the rock-cover vegetation of the northern Gulf and is abundant in many tidal pools. |
| Archival file | hancockunpub_Volume31/AHF-PUB-PE-03-10~093.tiff |
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