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NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 79
Type: Holotype is Loomis 5330, July 22, 1934, in the private
collection of Mrs. Nina Loomis, 1324 North Ogden Ave., Hollywood,
California. Isotype preparations are on slides 1187-1188 in HAHF.
Type locality: In beach drift, Anaheim Landing, Orange County, Calif.
Mexican distribution : Pacific Baja Calif.—D. 264, 8 km. south
of Punta Descanso, Jan.; D. 10394, Punta San Eugenio, Nov.
The Mexican plants compare favorably in all essentials with the type
of the species. The characters which differentiate it from Pterocladia
pyramidale are to be found in the basal cystocarps, the linear, extensive
tetrasporangial and antheridial sori, and in the near-unity ratio of sexual
to asexual plants. Several characters considered distinctive by Loomis,
namely, the relative thallus size, color, number of cortical layers, and
the size and shape of medullary rhizoidal filaments, do not seem to hold
good when compared in series with P. pyramidale.
Pterocladia pyramidale (Gardner) Dawson
Dawson, 1945, p. 93; Dawson, 1945b, p. 65; Dawson, 1949, p. 228.
Gelidium pyramidale Gardner, 1927a, p. 273, pis. 36, 37, fig. 1, 45, 46,
fig. 2. Gelidium okamurai Setchell & Gardner, 1937, p. 75, pl. 6, fig. 16,
pl. 17, fig. 38. Pterocladia okamurai (S. & G.) Taylor, 1945, p. 161.
Pterocladia okamurai forma densa Taylor, 1945, p. 161, pl. 37, fig. 1.
Pterocladia mexicana Taylor, 1945, p. 159, pl. 35. Pterocladia robusta
Taylor, 1945, p. 160, pl. 36. Gelidium pulchrum Gardner, as to Cedros
Island specimen interpreted by Dawson, 1949, p. 229.
Thalli 10-25 cm. high, consisting of several abundantly, irregularly
but distichously branched erect axes arising from a holdfast of entangled
stolons; erect axes compressed to strongly flattened, 0.6-1.5 mm. broad
in lower parts, 120-220 (350) p thick, 0.6-0.3 mm. broad above and
often becoming reduced and attenuated to 100 ft wide or less; branching
commonly irregularly alternate, but often opposite in part or nearly so,
moderately loose and open with intervals of 2-3 mm. between branches,
or sometimes densely, congestedly branched above, the filiform branchlets
becoming entangled and somewhat matted; branchlets tapered to a constricted base; transection elliptical in older parts, consisting of a medulla
of rather thick-walled cells 12-20 p in diameter grading into a pigmented cortex of about 3 layers, the outermost of cells slightly anti-
clinally elongated, to 5.0-6.5 p high, the medulla provided with a moderate to large number of rhizoidal filaments, these concentrated in the
Object Description
Description
| Title | AHF-PUB-PE-17-01~083 |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-17-01~083.tiff |
| Full text | NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 79 Type: Holotype is Loomis 5330, July 22, 1934, in the private collection of Mrs. Nina Loomis, 1324 North Ogden Ave., Hollywood, California. Isotype preparations are on slides 1187-1188 in HAHF. Type locality: In beach drift, Anaheim Landing, Orange County, Calif. Mexican distribution : Pacific Baja Calif.—D. 264, 8 km. south of Punta Descanso, Jan.; D. 10394, Punta San Eugenio, Nov. The Mexican plants compare favorably in all essentials with the type of the species. The characters which differentiate it from Pterocladia pyramidale are to be found in the basal cystocarps, the linear, extensive tetrasporangial and antheridial sori, and in the near-unity ratio of sexual to asexual plants. Several characters considered distinctive by Loomis, namely, the relative thallus size, color, number of cortical layers, and the size and shape of medullary rhizoidal filaments, do not seem to hold good when compared in series with P. pyramidale. Pterocladia pyramidale (Gardner) Dawson Dawson, 1945, p. 93; Dawson, 1945b, p. 65; Dawson, 1949, p. 228. Gelidium pyramidale Gardner, 1927a, p. 273, pis. 36, 37, fig. 1, 45, 46, fig. 2. Gelidium okamurai Setchell & Gardner, 1937, p. 75, pl. 6, fig. 16, pl. 17, fig. 38. Pterocladia okamurai (S. & G.) Taylor, 1945, p. 161. Pterocladia okamurai forma densa Taylor, 1945, p. 161, pl. 37, fig. 1. Pterocladia mexicana Taylor, 1945, p. 159, pl. 35. Pterocladia robusta Taylor, 1945, p. 160, pl. 36. Gelidium pulchrum Gardner, as to Cedros Island specimen interpreted by Dawson, 1949, p. 229. Thalli 10-25 cm. high, consisting of several abundantly, irregularly but distichously branched erect axes arising from a holdfast of entangled stolons; erect axes compressed to strongly flattened, 0.6-1.5 mm. broad in lower parts, 120-220 (350) p thick, 0.6-0.3 mm. broad above and often becoming reduced and attenuated to 100 ft wide or less; branching commonly irregularly alternate, but often opposite in part or nearly so, moderately loose and open with intervals of 2-3 mm. between branches, or sometimes densely, congestedly branched above, the filiform branchlets becoming entangled and somewhat matted; branchlets tapered to a constricted base; transection elliptical in older parts, consisting of a medulla of rather thick-walled cells 12-20 p in diameter grading into a pigmented cortex of about 3 layers, the outermost of cells slightly anti- clinally elongated, to 5.0-6.5 p high, the medulla provided with a moderate to large number of rhizoidal filaments, these concentrated in the |
| Archival file | hancockunpub_Volume21/AHF-PUB-PE-17-01~083.tiff |
