摘要:

MACNAIR, M. R., 1989.A new species ofMimulusendemic to copper mines in California. The distribution and morphology ofMimulus cupriphilus, a new species restricted to two small copper mines in Calaveras County, California, is described. A comparison of flowers collected in the wild ofM. guttatusand the new taxon shows that they differ considerably. These two species and three other species from theM. guttatuscomplex,M. nasutus, M. laciniatusandM. nudatuswere grown in a glasshouse and compared. The five species were all clearly distinct. The distribution ofM. cupriphilusis consistent with it having evolved comparatively recently on one or both of the two copper mines on which it is found.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01707.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

NEGBI, M., 1989.Theophrastus on geophytes. The nature of the geophilous organs of the geophytes described by Theophrastus (371‐287 B.C.) inHistoria PlaniarumandDe Causis Planlarumis presented and discussed. Most of the geophytes and the hydrogeophytes mentioned in these books (excluding species ofAllium, biennial vegetables, and a few others) are critically reviewed. Certain lost agricultural practices mentioned by Theophrastus are strengthened and made explicable by comparisons from Pliny'sNatural History, and Hebrew literature of the first centuries A.D.:MishnahandTalmud.Theophrastus's interest in plants is shown to be of a pure nature although most of his examples are cultivated or otherwise useful plants. The possible sources of his knowledge of Egyptian plants are discusse

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01708.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

ENDRESS, P. K.&HUFFORD, L. D., 1989.The diversity of stamen structures and dehiscence patterns among Magnoliidae. Structure of stamens, particularly the patterns of anther dehiscence were studied over a wide range of families of the Magnoliidae with emphasis on the Magnoliales and Laurales as the most conservative orders of the angiosperms. Valvate dehiscence by proximal and distal stomial bifurcation was found (in addition to the already knownSarcandraandPolyalthia) for the first time in Degeneriaceae, Himantandraceae, Eupomatiaceae, in some additional Annonaceae, and inPeumusof the Monimioideaesensu lata.At least proximal bifurcations of the stomia occur in some Magnoliaceae and Ranunculaceae. An endothecial‐like connective hypodermis was found (in addition to the already known Chloranthaceae and Magnoliaceae) in some Annonaceae, inPseudowintera(Winteraceae), and inThalictrum(Ranunculaceae). In the Annonaceae an endothecial‐like connective hypodermis is partly correlated with valvate dehiscence by stomial bifurcations (as in many Hamamelididae). However, in many Magnoliidae stamens with this valvate pattern the anther is massive, especially in ‘laminar’ stamens, and the counterforce to the opening valves is therefore provided on the morphological and not on the histological level. Concomitant with valvate dehiscence by circular or elliptic flaps in the Laurales is often structural and functional dissocation of the two pollen sacs of a thcca, which is expressed by: (1) independent opening of each pollen sac, (2) lack of disruption of the interlocular zone of a theca, (3) frequent occurrence of asymmetry of the two pollen sacs of the theca, (4) frequent loss of one pollen sac per theca. In Berberidaceae with similar flaps asymmetry of the two pollen sacs of a theca is also common. These finds, together with the detection by paleobotanists of valvate anthers from the Lower Cretaceous, point to the probability that valvate anthers were more common in primitive angiosperms than previously

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01709.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SERUSIAUX, E., 1989.Foliicolous lichens: ecological and chorological data. Foliicolous lichens are present throughout tropical and subtropical forests but are particularly common in undisturbed rain forests at low elevations. Their presence in south‐west Europe and in the Caucasus with 23 species is considered to be a relic of Tertiary times. Ecological groups (in the sense of P. Duvigneaud) are determined, especially for the European taxa. Factorial analysis has been performed on a large collection from Central East Africa which enables the relationships between the foliicolous floras of the different types of forests present in the area (equatorial, mountane, riverine, etc.) to be determine

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01710.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01711.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01707a.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY