摘要:

TheElymus parviglumisgroup, characterized by having relatively small plant size, single spikelets per rhachis node, nodding spikes, and small to medium sized glumes, is revised taxonomically. Previously, a total of twenty seven taxa have been described in this group. In the present treatment, fifteen tetraploid species (2n = 4x = 28) and one interspecific hybrid are recognized, namely,E. antiquus, E. burchan‐buddae, E. sclerus, E. schugnanicus, E. jacquemontii, E. yangii, E. cacuminus, E. retroflexus, E. serotinus, E. altissimus, E. anthosachnoides, E. formosanus, E. longearistatus, E. canaliculatus, E. caucasicus, andE. × russellii. Synonymy, morphological description, cytogenetic data, and a key to these species are presented in this pap

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00118.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Intergeneric crosses were made between the four species ofEremopyrum(2n = 14, 28) and 16 species (2n = 14, 28, 42) from 8 genera of the Triticeae. Seed set was obtained in 22 of 42 different combinations. Only 9 resulted in progeny and only one was diploid. The hybrids were morphologically intermediate between the parents and it has been confirmed that perenniality dominates over annuality. The very low pollen fertility of the hybrids was caused by very low chromosome pairing in meiosis and supports the uniqueness of theEremopyrumgenome. Autosyndesis between the chromosomes ofE. orientaleis proposed and for that reason reevaluation of the relationships withinEremopyrumis needed.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00119.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Five new species of ferns are described:Alsophila esmeraldensis, Blechnum rheophyt‐icum, Cyathea amazonica, C. hemiepiphytica, andC. palaciosii. Two new combinations are made:Cyathea bipinnataandPecluma pastazensi

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00120.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Andropogon crispifoliusa new species from the environs of the Parque Nacional das Emas (in the states of Goiás and Mato Grosso do Sul) in central Brazil is here described, illustrated and compared withA. pohlianusHack. It is a large, perennial, coarse grass characterized primarily by its strongly crispate older leaves. This new species is placed in sect. Notosolen Stapf, previously represented in South America by a single species,A. pohlianus

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00121.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

A new chasmophitic species ofBrachysiphon, B. microphyllumfrom the dry interior mountain ranges of the Southern Cape is described.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00122.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

The new generic nameStirtonanthusis proposed to replace the illegitimateStirtoniaVan Wyk&Schutte (1994), which proves to be a later homonym ofStirtonia A. L. Smith (1926) andStirtoniaR. Brown (1900).

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00123.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

The lipophilic secretory cavities observed in the leaf ofPorophyllum lanceolatum(Asteraceae) are scattered throughout the lamina and around its crenate margins. In the young leaf the cavities are initiated, and their development completed, while the surrounding tissues are still at early stages of differentiation. The cavity lumen has a lysigenous origin. Cell lysis, expansion of the developing leaf and, probably, the pressure exerted by the accumulation of secretory products, are believed to account for the gradual enlargement of the lumen. Concomitantly with ctll disintegration, which occurs throughout development, divisions take place in all cells of the gland. A mature cavity has a multilayered epithelium. Histochemical tests for RNA, proteins, phenolics and pectic polysaccharides revealed intense staining of the content of the epithelial cells in the early stages of cavity development, and a decrease in staining towards its maturity. Staining for lipids is intense in all developmental stages. Tests on the material observed in the lumen of mature cavities, show positive results for lipids, pectic polysaccharides and phenolics.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00124.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Central Western Norway was divided up into seven mountain areas, representing an east‐west gradient from Hardangervidda (area A) westwards to the islands of Tysnes and Stord (area G). The alpine flora of totally 138 species thins out gradually where A has the greatest number (137 species) and G has the fewest (55 species). A drop of 83 species from east to west must be due to ecological barriers which prevent growth on the coastal mountains. Several factors have been taken into account and discussed. Rich Cambro‐Ordovician rocks are present in all the explored areas, but the zone narrows towards the west due to the overlying base‐poor thrusted rocks in the Caledonian nappe system. West of Hardangervidda, the summits of the mountains are almost entirely composed of acid rocks, and habitats for basiphilous species are therefore not present at the highest altitudes. Climate during the season of winter dormancy differs much more than during the growing season between east and west. Alpine plants require climatic conditions conducive to the termination of growth in autumn, a state of quiescence due to cold winters, and stable snow conditions which give a rapid transition from winter to summer. As the oceanic climate does not comply with these requirements, the number of alpine species declines. The alpine flora of Westem Norway is closely related to that of Great Britain. This is probably explained historically by a common origin during the Late Weichselian p

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00125.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

By the creation of Køge Bay Seaside Park in 1978 the opportunity was given to study the establishment of vegetation and primary succession in a man‐made coastal area. As the soil consists of marine material from the Baltic Sea, no organic matter or seedbank was present. The first steps of primary succession were followed in 1980, when the initial inventories of flora immigration and soil development were carried out in coastal grasslands and plantings. The surveys were repeated in 1992 and 1993. Except for the planted woody species and a few sown grasses, all other species of plants have reached the area through natural dispersal of diaspores. The total number of species in the permanent plots has increased from 26 in 1980 to 91 in 1993. The results indicate that this number will continue to increase in the coming years until a certain level. Then it will probably decrease as a result of competition from woody species, unless the vegetation is kept in a steady state by disturbances or management. Today the area is very far from the initial situation, and the off‐shore barrier has changed towards a landscape dominated by small groves and grasslands of an urban common

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00126.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Morphological and cultural studies ofPolyporus maculatissimusandP. portentosusare presented.Neolentiporusgen. nov. is proposed to accommodateP. maculatissimus, a species with a striking macromorphological similarity with the north temperateP. squamosus. The new genus is characterized by medium to large stipitate fruitbodies with a poroid hymenophore, circular to flabellate pilei with a scaly surface and an excentric or lateral stipe that sometimes is reduced to a short, robust umbo. The hyphal system is dimitic with clamped, irregularly thick‐walled generative hyphae that do not react with cresyl‐blue, and terminal, unbranched, thick‐walled skeletal hyphae that are strongly metachromatic in cresyl‐blue. Spores are cylindric, hyaline, thin‐walled, inamyloid and binucleate. The sexuality is bipolar, the nuclear behavior is astatocoeno‐cytic and the associated wood‐rot is brown. The new genus is regarded as the poroid counterpart of the agaricoidNeolentinus. Polyporus portenrosusis included inLaetiporuson the basis of its yellowish fruitbodies, its soft, punky context, its hyphal system composed of simple septate generative hyphae and binding hyphae, its holocoenocytic nuclear behavior and its associated brown wood‐rot. A new code symbol, i.e. ‘9s’ is proposed to codify the presence, in cultures, of simple‐septate generative hyphae with irregu

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00127.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY