摘要:

Digitaria brunoana (Gramineae), a new species from Somalia. - Digitaria brunoana, a new species occurring on the coastal sand dunes at Gesira near Mogadishu (Somalia), is described. This new taxon is related toD. longiflorawhich is distributed in the Tropical Africa.

ISSN:0017-0070    

DOI:10.1080/11263508809429405

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Analytical key for the identification of the Frullania species in Europe and Macaronesia. - After some methodological remarks about the observation of theFrullania(Marchantiophytina, Bryophyta), akey for the identification of the 14 species of the genus in Europe and Macaronesia is provided. For each species, critical taxonomical and/or chorological notes, and a key for infraspecific taxa are given. Two important taxonomical and nomenclatural notes are made aboutF. aeolotisand about theF. cesatiana / F. muscicola / F. ripariacomplex. The taxa recognized in Europe and Macaronesia are listed with most of their synonyms.

ISSN:0017-0070    

DOI:10.1080/11263508809429406

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

75 infrageneric taxa of lichens are reported from the Nuova Gussonea Botanic Garden, situated on the southern slopes of M. Etna (Sicily). The most significant aspects of lichen vegetation on rock and bark are briefly described.

ISSN:0017-0070    

DOI:10.1080/11263508809429407

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

First record of Streblonemopsis irritans Valiante from the Ionian Sea. - The occurrence near Catania (Eastern Sicily) of fertile specimens ofStreblonemopsis irritansValiante (Phaeophyta, Ectocarpaceae) (onCystoseira zosteroides(Turner) C. Agardh), up to now recorded only from the type locality (Gulf of Naples), France (Côte des Albères) and Spain (Catalan coast), is reported.

ISSN:0017-0070    

DOI:10.1080/11263508809429408

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A contribution to the fossil Silicoflagellates of the late Miocene in Central Italy. - A microscopic analysis of fourteen diatomite samples from a Messinian (late Miocene) stratigraphic series, in central-eastern Italy, has been carried out in order to verify the presence of Silicoflagellates. The skeletons of eight taxa were found in good condition and identified. The most abundant and continuous in the stratigraphic series examined areDictyocha fibulaandDistephanus speculum, also known in the present-day seas;Cannopilus sphaericus, a very rare and interesting species extinct in the Miocene, is limited to only two samples. On the basis of the Silicoflagellates found, it is possible to suggest that they lived in an open sea with 30–40‰ salinity and a temperature of 10–20°C. A very similar situation is present nowadays in the middle-western Adriatic Sea.

ISSN:0017-0070    

DOI:10.1080/11263508809429409

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Carnosol (11,12-dihydroxyabieta-8,11,13-trien-20-oic acid 20,7-lactone), and rosmanol (7α, 11, 12-trihydroxy-abieta-8, 11, 13-trien-20 oic acid-20, 6-lactone), two abietane diterpenes previously isolated fromRosmarinus officinalis, have been isolated from leaves ofDorystoechas hastata. Luteolin, luteolin-7-glucoside, 6-methoxyluteolin-7-glucoside, caffeic acid and chlorogenic acid have also obtained from the same source. The co-occurrence of carnosol, rosmanol and 6-methoxyluteolin-7-glucoside support the close relationship of these two genera.

ISSN:0017-0070    

DOI:10.1080/11263508809429410

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The essential oils of Nepeta coerulea subsp. coerulea, Nepeta nepetella subsp. aragonensis and Nepeta cataria. - Essential oil composition of three iberianNepetawere studied by chromatographic and spectrometric methods. The essential oils are constituted mainly of diasteroisomers of nepetalactone. These compounds may be used as chemosystematic characters.

ISSN:0017-0070    

DOI:10.1080/11263508809429411

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

In the present work the results on antibiotic activity of the extracts from the liverwortConocephalum conicumand the mossesMinium undulatumandLeptodictyum riparium, tested against 8 bacterial strains pathogenic to man, are referred to. The extracts have been obtained, according the method suggested by McClearyet al. (1960), in either organic solvents or in water solution. The extracts have been proved active on both bacteria Gram + ve (G +) and Gram—ve (G—), in addition the extracts fromConocephalum conicumandLeptodictyum riparium(extracts in organic solvents in particular) were the most effective in the tests. The acetone extracts fromLeptodictyum ripariumshowed the highest value of inhibition againstPseudomonas aeruginosa(bacterium responsible for serious opportunist infections). Our results on antibiotic activity of Bryophytes only partly agree with literature for either species showing activity or for the intensity of such activity. Among the three bryophytes employedLeptodictyum ripariumshowed the best inhibitory power against all bacteria tested. This result seems particularly interesting in relation to the possible competition between species occurring in the water where this moss preferentially grows. The phenomenon of antibiosis in the bryophytes is discussed also in relation to symbiotic or commensal relationships existing with soil bacteria and/or fungi.

ISSN:0017-0070    

DOI:10.1080/11263508809429412

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Administration of exogenous cytokinins to lettuce seedlings germinating in the light, inhibits the accumulation of chlorophyll in the cotyledons. This action seems to be independent from the type of modification in N-6 or N-9 position of the purine ring of cytokinins. This fact suggests that the purine ring itself could be involved in this particular cytokinin action. The biochemical event(s) affected are unknown.

ISSN:0017-0070    

DOI:10.1080/11263508809429413

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The process of primary growth in 2-year-old seedlings of 11 populations ofPinus halepensisMill. is described. At the end of the first growing season one type of apical structure was observed: type-1, a tuft of primary needles placed close together, surrounding and protecting a meristematic apex.

ISSN:0017-0070    

DOI:10.1080/11263508809429414

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor