摘要:

ARROYO, S., 1986.Leaf anatomy in the Tecophilaeaceae. Leaf anatomy of 12 species of the seven genera in the Tecophilaeaceae is described. Characters of taxonomic value within the family are the shape of epidermal cells, hairs and venation. Characters of diagnostic importance at the family level include the occurrence of raphide sacs in the mesophyll, the absence of vessels in the aerial part of the plant and the presence of anomocytic stomata. Leaf anatomy is of restricted value within the family but supports the retention of bothCyanastrumandWalleriawithin the Tecophilaeaceae.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01029.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

PHILLIPSON, P. B., 1986.Taxonomy of Monopsis(Lobeliaceae): M. simplex, M. debilis and a new species. The taxonomyof Monopsis simplexandM. debilisis revised. Their typification is clarified and the misinterpretation of the nameM. simplexby previous authors is discussed. A new species ofMonopsisrelated toM. simplexis described. It occurs in the mountains of the southern Cape Province of South Africa. WithinM. debilisthree varieties are recognized and two new varietal combinations are made. Diagnostic descriptions of the taxa are given and their relationships with other species of the genus are discussed. Three hundred and forty herbarium specimens were examined, representing 234 separate collections.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01030.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

BRAITHWAITE, A. F., 1986.The Asplenium aethiopicum complex in South Africa. Members of the complex in South Africa form an extensive polyploid series with three sexual and two apomictic cytotypes. The sexual tetraploid (n= 72), octoploid (n= 144) and dodecaploid (n= 216) are described asAsplenium aethiopicumsubsp.tripinnatum, A. aethiopicumsubsp.aethiopicumandA. aethiopicumsubsp.dodecaploideumrespectively, and the apomictic octoploids (2n= 288) and decaploid (2n= 360) asA. aethiopicumsubsp.filare, which is subdivided into apomictspseudqfilare(8X),transvaalense(8 X) andcapense(10 X). Comparison of their ecology and distribution suggests there is an increased tolerance to drier and cooler conditions with increase in level of polyploidy among the sexual subspecies and that the apomicts are tolerant of even more extreme conditions. The natural hexaploid hybrid betweenA. aethiopicumsubsp.aethiopicumandA. aethiopicumsubsp.tripinnatumis described and its meiotic pairing analysed. The numerical structure of the polyploid series in Africa generally suggests the complex represents a secondary polyploid cycle based on a genome of 72 chromosomes, and the unequivocal antosyndesis between the genomes ofA. aethiopicumsubsp.aethiopicumshown by the chromosome pairing in the hexaploid hybrids suggests the octoploid is either a segmental allopolyploid or autopolyploid. While it can be concluded from the morphology and cytology ofA aethiopicumsubsp.filarethat the apomicts have arisen more than once, their precise mode of origin is unknown, although there is good evidence in at least one case for suggesting a hybrid origin.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01031.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

SPICER, R. A., 1986.Pectinal veins: a new concept in terminology for the description of dicotyledonous leaf venation patterns. Mid‐Cretaceous dicotyledonous leaves frequently exhibit continuous variation in venation patterns. This poses considerable problems when concise description and taxonomic partitioning of leaf material is attempted. Often it is extremely difficult to differentiate consistently between pinnate and palmate organization. A new terminology is proposed that dispenses with the need to differentiate between pinnate and palmate organization or between primary and secondary vein orders which commonly intergrade. Emphasis is placed upon the pattern of vein courses and branching hierarchy which provides unambiguous reference points for architectural descriptions and analyse

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01032.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

PANIGRAHI, S. G., 1986.Seed morphology of Rotala L., Ammannia L., Nesaea Kunth and Hionanthera Fernandes&Diniz (Lythraceae). Seed‐surface characteristics ofAmmonia lalifoliaL.,Rotala verticillarisL.,Nesaea trifloraComm. ex Kunth andHionanthera garciaeFernandes&Dinz were studied using the SEM. Seeds from herbarium specimens moistened in water produce cracks along the intercellular walls and distinctive types of invaginating ‘hairs’. These ‘hairs’ are mucilaginous in nature and diagnostic at the species level. They are released in profusion from the upper convex surface of the testa. Viable seeds ofAmmonia bacciferaL., similarly treated, exude, in addition to the ‘hairs’, mucilaginous globules from the lower concave surface during germination. The invaginating ‘hairs’ arise diagonally from the roof of the epidermal cells of the testa and protrude to the lumen of the epidermal cells. A sac of mucilage is observed swelling out on the inner flat surface of the developing seeds. The biological functions of these ‘hairs’ and mucilage globules in germinating seeds in relation to seed dispersal and regulation of germination in appropriate

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01033.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

EARRANT, C. A.&JONES, E. B. G., 1986.Haligena salina: a new marine pyrenomycete. Haligena salina sp. Nova(Ascomycotina, Sphaeriales, Halosphaeriaceae) collected on wood from San Juan Island, Washington State, U.S.A., and on reeds from Pisa, Italy is described. The species is compared withHaligena elaterophoraj.Kohlmeyer and species in the genusRemisporaLinder.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01034.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY