ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00230.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00231.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

AbstractA study was made of the structure of 32 fossil palmlike wood samples, found in diluvial sands in the East of the Netherlands. 27 of them proved to belong to four species ofPalmoxylon;two of them are described as new. Five samples belong to a palmroot structure newly described here.ZUSAMMENFASSUNGEs wurden insgesamt 32 Geschiebehölzer palmenartiger Natur aus den Östlichen Niederlanden (Provinzen Gelderland und Overijssel) bearbeitet. Es stellte sich heraus, dass 27 Stücke zu 4Palmoxylon‐Arten gehören, darunter 2 neue; 5 Stücke gehören zu einer neu beschriebenen Palmenwurzels

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00232.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00233.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

AbstractIn this preliminary investigation attention was paid to pollen morphology of West‐European species of the Rosaceae. Some new terms were used like fastigium, endocingulus etc. The terminology of Iversen and Troels‐Smith has been followed in addition to improvements by Erdtman. A key is given to the types and subtypes for the use of pollen analytical investigators.Sanguisorba officinalisappeared to be always 3‐colporate and not G‐co

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00234.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

AbstractThe pollenflora of the browncoal mined in the quarry “Maria Theresia”, Herzogenrath, Western Germany has been investigated. Samples were taken along a section of 12.50 meters at intervals of 50 centimeters.Identifications were made on the basis of form‐genera and form‐species; this working method gives a broad information on pollen types, but does not relate the fossil pollen types primarily to recent plant taxa.Pollen types which are considered to belong toBetulaceae/Myricaceaemake up the biggest part of the pollen assemblages.The construction of a “Composite diagram” forBetulaceae/Myricaceaeproved to be useful and might give a better idea on paleoecologic conditions.The stratigraphic position of the browncoal examined is thought to be Lower “Hauptflöz”, possibly Morken or Frimm

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00235.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

AbstractThe Upper Bunter palynological assemblage described includes 54 species, assigned to 29 genera. Seven genera (Scabratisporites, Guttatisporites, Lapposisporites, Pseudogravisporites, Paralundbladispora, TaeniaepollenitesandTubantiapollenites)and 39 species are new; three generic descriptions are emended(Apiculatasporites, ColpectopollisandAngustisulcites)and three new combinations are proposed. Bisaccate pollen grains average 84 %; within this group no Upper Permian elements could be demonstrated. The assemblage is compared with other European Lower and Middle Triassic assemblages; there are no close similarities to assemblages outside Europe.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00236.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

AbstractThis paper deals with the results of field reconnaissance and pollen‐analysis of peatbeds occurring in the Dune area near the city of The Hague (The Netherlands). Such peatbeds were known already to occur at the surface as filling of depressions (former beach plains) of the Older Dune system, outside the area covered by Younger Dunes. It could be shown that below the latter a very similar pattern of peat‐filled depressions exists.Pollen‐analysis and radiocarbon dating indicate that formation of Old Dune sand took place until about the beginning of our era, though it might in places have been interrupted by a forest‐phase at the end of Subboreal times, around 1200 B.C. In part vegetation was characterised by dune‐shrub, including not onlyHippophaëbut also commonlyJuniperus. After the formation of the Older Dunes a period of reafforestation followed, which in the western‐most coastal area came to an end by the formation of the Younger Dunes, which event in this area could be dated around 1

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00237.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00238.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Abstract1Light stimulates the conversion of L‐phenylalanine and of trans‐cinnamic to p‐coumaric acid in hypocotyl segments from dark‐grown gherkin seedlings.2Inhibition by cycloheximide of the increase in the rate of hydroxylation of cinnamic acid in response to light indicates thatde novosynthesis of enzyme, probably cinnamic acid hydroxylase, is involved.3The responsivity to light is higher in the apical part than in the basal part but the spectral sensitivity does not alter significantly over the length of the hypocotyl. The photoreceptor directly responsible for the effect of blue light seems to be different from phytochrome.4Particularly in red and far‐red light an effect of the cotyledons on the hydroxylase activity to be obtained in the hypocotyls becomes apparent.5There is a general correlation between the influences of light quality, light intensity and duration of irradiation on the hydroxylase activity and the accumulation of hydroxycinnamic acids in the gherkin hypocotyl.6The implications of this photo‐inducible reaction for the regulation of lignification and cell elongation ar

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1966.tb00239.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY