The Fresh-water Algae of the United StatesMcGraw-Hill, 1950 - 719 pagine This edition follows the general plan of the first edition, except for treatment of the species in the various genera. In the first edition, where there were less than ten species in a genus, each was named and briefly characterized. In this edition the species of a genus are listed and references given to sources where a complete description of each of them can be found. Another change is the addition of a survey of the Charophyceae, Cryptophyceae, and Chloromonadales, groups that were not treated in the first edition. |
Dall'interno del libro
Risultati 1-3 di 76
Pagina 54
... Akinetes may develop directly into new plants ( Pithophora2 ) or , as is generally the case , the protoplast of a germinating akinete may divide into a number of zoospores which are liberated in the usual fashion . Sexual Reproduction ...
... Akinetes may develop directly into new plants ( Pithophora2 ) or , as is generally the case , the protoplast of a germinating akinete may divide into a number of zoospores which are liberated in the usual fashion . Sexual Reproduction ...
Pagina 194
... akinetes . These may be formed directly from vegetative cells , or akinete formation may be pre- ceded by vegetative ... akinetes or may have the cells dividing into four daughter cells that become akinetes . Akinetes are liberated by a ...
... akinetes . These may be formed directly from vegetative cells , or akinete formation may be pre- ceded by vegetative ... akinetes or may have the cells dividing into four daughter cells that become akinetes . Akinetes are liberated by a ...
Pagina 550
... akinete formation is not absolutely necessary to tide the alga over long unfavorable periods , since , in the experiments just cited , it was found that after a period of 50 years there was a growth of species that do not form akinetes ...
... akinete formation is not absolutely necessary to tide the alga over long unfavorable periods , since , in the experiments just cited , it was found that after a period of 50 years there was a growth of species that do not form akinetes ...
Sommario
NATURE EVOLUTION AND CLASSIFICATION OF THE ALGAE | 1 |
THE DISTRIBUTION AND OCCURRENCE OF FRESHWATER ALGAE | 12 |
COLLECTION PRESERVATION AND METHODS OF STUDYING THE FRESHWATER ALGAE | 27 |
Copyright | |
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Parole e frasi comuni
akinetes algae algal apical aplanospores Asexual reproduction Auxospores axial axis basal biflagellate branches cell division cell wall Chlorophyceae chloroplast chromatophores colony conjugation contains contractile vacuoles cup-shaped cylindrical cytoplasm daughter cells develop diatoms differ as follows discoid ellipsoidal elongate epiphytic eyespot filaments flagella flagellated flagellum flora formation four free-floating fresh-water frustules G. M. Smith G. S. West gametes Geitler gelatinous gelatinous envelope gelatinous material gelatinous sheath genus germination girdle view globose growing heterocysts Ibid intercalary bands irregularly isogamous Klebs Korshikov Kütz laminate layer liberated longitudinal lorica motile Myxophyceae Näg nodule nucleus Oedogonium ornamentation parent-cell wall parietal Pascher plankton plast poles portion posterior Protistenk protoplast pyrenoid quadriflagellate raphe rhizoidal semicells sessile setae Sexual reproduction shape solitary species found spherical spines Spirogyra spores starch statospores structure thallus transverse trichomes Ueber unicellular uninucleate usually valve view vegetative cells Volvocales zoospores zygote