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Culture Studies on the Morphology and Life History of Aglaothamnion herveyi (Howe) comb. nov., with Notes on A. felipponei (Howe) comb. nov.

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Abstract

Three Caribbean species of Callithamnion are recognized to be species of Aglaothamnion. The life history of Aglaothamnion herveyi (Howe) comb. nov., completed in culture, was a Polysiphonia type, but this species also reproduced by propagules in both gametophytic and tetrasporophytic plants. Propagules recycled their respective phases. Aglaothamnion herveyi is typically covered with fine sediment, making the plant very inconspicuous in the field. The morphology and taxonomic status of Aglaothamnion felipponei (Howe) comb. nov. is clarified, and Aglaothamnion uruguayense (W. Taylor) comb. nov. is proposed.

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In enriched sea-water cultures inoculated with a mixture of algae and other organisms, concentrations of GeO2 above 1.5 mg/l specifically suppressed the growth of diatoms. In experiments with 14 pure cultures of diatoms (10 species), 1 mg GeO2/l sufficed to reduce the growth rates significantly; 10 mg GeO2/l was even more inhibitory to growth, and in a few cases killed the cells. Phaeodactylum tricornutum, the most weakly silicified diatom, was the least sensitive to GeO2 inhibition. In experiments with four selected marine species, an appropriate increase in the SiO2 concentration of the medium reversed the inhibitory action of GeO2 on growth. A similar effect of SiO2 was observed in growth experiments with the fresh-water diatom Navicula pelliculosa. (A non-silicified green fiagellate responded quite differently, its growth being unaffected by relatively high concentrations of GeO2.) At these low concentrations, GeO2 presumably had no effect on respiratory metabolism, since, even in concentrations of GeO2 as high as 400 mg/l, oxygen uptake of N. pelliculosa was unimpaired. All of these experimental results are consistent with the hypothesis that GeO2 is a specific inhibitor of silicate utilization.
Index Herbariorum. Part I. The Herbaria of the World New York Bo­ tanical Garden, Bronx, NY. x + 693 pp. [Regnum Vegetabile
  • Holmgren P K Holmgren
  • N H C Barnett L
  • M A Howe
HOLMGREN P.K., HOLMGREN N.H. & BARNETT L.C. 1990. Index Herbariorum. Part I. The Herbaria of the World. New York Bo­ tanical Garden, Bronx, NY. x + 693 pp. [Regnum Vegetabile. Vol. 120]. HOWE M.A. 1918. Algae. In: Flora of Bermuda (Ed. by N.L. Britton), pp. 489-540. Charles Scribner's Sons, New York. xi + 585 pp. HOWE M.A. 1931. Notes on the algae of Uruguay. Bulletin of the Torrey Botanical Club 57: 605-610.
Therefore the following new com­ binations are proposed: Aglaothamnion herveyi (Howe) comb. nov. Figs 1,4-15 BASIONYM: Callithamnion herveyi Howe 1918; Flora of Ber­ muda
  • Referred
  • Aglaothamnion
referred to Aglaothamnion. Therefore the following new com­ binations are proposed: Aglaothamnion herveyi (Howe) comb. nov. Figs 1,4-15 BASIONYM: Callithamnion herveyi Howe 1918; Flora of Ber­ muda (Ed. by N.L. Britton), p. 528. MATERIAL EXAMINED: Bermuda: M.A. Howe FSC-8005, Smith Bay, communicated by F. S. Collins as Callithamnion hookeri (Dillwyn) S.F. Gray, xii.1913, Type, (NY);
on rocks and coral fragments, 3-5 m, 22.x.198 7, tetrasporangial, carpospo­ rangial and spermatangial; NEA-264, ibid
  • Cabo Rojo
  • Ei
  • Faro
  • Bahia
NEA-181, Cabo Rojo, EI Faro, Bahia Salinas, on rocks and coral fragments, 3-5 m, 22.x.198 7, tetrasporangial, carpospo­ rangial and spermatangial; NEA-264, ibid., 14.i.1987 (MSM);
Flora marinha do litoral norte do estado de Sao Paulo e regiones circunvizinhas Silicon metabolism in diatoms, V: germanium di­ oxide, a specific inhibitor of diatom growth
  • Joly A B Pis
  • B Joly A
JOLY A.B. 1957. Contribu�o ao conhecimento da flora ficol6gica marinha da Baia de Santos e Arrededores. Boletim No. 217 Facul­ tade de Filoso/u.l, Ciencias e Letras da Universidade de Sao Paulo, Serie Botanica 14; 217: 7-199, 19 pis. JOLY A.B. 1965. Flora marinha do litoral norte do estado de Sao Paulo e regiones circunvizinhas. Boletim Facultade de Filoso/u.l, Ciencias e Letras, Universidade de Siio Paulo, Serie Botanica 21; 294: 1-396, 59 pis. LEWIN J. 1966. Silicon metabolism in diatoms, V: germanium di­ oxide, a specific inhibitor of diatom growth. Phycologia 6: 1-12.
I: Ceramiales. Boletim Facultade de Filosofia, CiI?n­ cias e Letras 1-277, pis A-D + 1-30, I map Hybridization and morphogenesis in Callithamnion hookeri (Dill.) S.F. Gray (Rhodophyceae, Cerami­ ales) from disjunct northeastern Atlantic populations
  • Oliveira E C De
  • R Bula-Meyer
OLIVEIRA E.C. DE 1969. Algas marin has do sui do estado do Espirito Santo (Brasil), I: Ceramiales. Boletim Facultade de Filosofia, CiI?n­ cias e Letras, Universidade de sao Paulo, Serie Botanica 26; 343: 1-277, pis A-D + 1-30, I map. RUE NESS J. & R UENESS M. 1982. Hybridization and morphogenesis in Callithamnion hookeri (Dill.) S.F. Gray (Rhodophyceae, Cerami­ ales) from disjunct northeastern Atlantic populations. Phycologia 21: 137-144. SC HNETfE R R. & BULA-MEYER G. 1979. Rodoficeas nuevas para la costa Atlantica de Colombia. A nales dell nstituto dell nvestigaciones Marinas de Punta Betin 11: 71-85.
Growth media-marine. In: Handbook of Phy­ cological Methods Materiales para una fl ora marina de las rias bajas gallegas
  • J Mclachlan
McLACHLAN J. 1973. Growth media-marine. In: Handbook of Phy­ cological Methods (Ed. by J. R. Stein), pp. 25-51. Cambridge Uni­ versity Press, Cambridge. MI RAND A F. 1934. Materiales para una fl ora marina de las rias bajas gallegas. Boletfn de la Real Sociedad Espanola de Historia Natural 34: 175-180.
PiJerrer-863, Luquillo, East of Luquillo, epiphytic on Udoteaf l abellum (Ellis et Solander) Howe, as Callithamnion byssoides Amott ex Har­ vey, 27.iii
  • M Diaz
M. Diaz-PiJerrer-863, Luquillo, East of Luquillo, epiphytic on Udoteaf l abellum (Ellis et Solander) Howe, as Callithamnion byssoides Amott ex Har­ vey, 27.iii.1959, (MSM);
Marine Algae of the Eastern Tropical and Sub­ tropical Coasts of the Americas Aceto-iron-haematoxylin-chloral hydrate for chromosome staining
  • W R Taylor
  • Witt Mann W
TAYLOR, W.R. 1960. Marine Algae of the Eastern Tropical and Sub­ tropical Coasts of the Americas. University of Michigan Press, Ann Arbor. 870 pp. WITT MANN W. 1963. Aceto-iron-haematoxylin-chloral hydrate for chromosome staining. Stain Technology 35: 683-695.