Summerell B.A.,Royal Botanic Gardens and Domain Trust |
Leslie J.F.,Kansas State University
Fungal Diversity | Year: 2011
Fusarium is globally one of the most important genera of fungi, causing an array of plant diseases, producing mycotoxins and adversely affecting human health. The genus is taxonomically complex and accurate identification requires a suite of different morphological, biological and phylogenetic markers. Herein we review some of the major advances in our knowledge of Fusarium that have occurred over the past 50 years. © Kevin D. Hyde 2011.
Renner M.A.M.,Royal Botanic Gardens and Domain Trust
Polish Botanical Journal | Year: 2013
Lejeunea subelobata Carrington and Pearson has been regarded as a synonym of L. drummondii Taylor, but the two species differ in patterns of variation in lobule morphology, shapes of the gynoecial bracteole, female bract underleaf and vegetative underleaves; in stem anatomy, and ecology. Lejeunea subelobata is a rheophyte from south-east Australia, Tasmania, and New Zealand that grows primarily as a lithophyte on rock within and around waterways, in association with basicolous substrates particularly basalt, rhyolite and andesite. Lobules in L. subelobata are always explanate, the female bract underleaf is obovate, underleaves are rotund and remote, and the stem medulla has 19-26 cells with small concave trigones. Lejeunea drummondii is, in its current circumscription, an ecologically and morphologically malleable taxon confined to Australia. The relationship between L. drummondii and plants from New Zealand described as L. epiphylla Colenso nom. illeg. requires further investigation.
Renner M.A.M.,Royal Botanic Gardens and Domain Trust
Botanical Journal of the Linnean Society | Year: 2015
The quantification of lobule shape for Radula spp. shows that there is overlap in lobule shape space occupied by subgenera, such that lobule shape does not always reflect relationships. Morphological convergence caused by lineages repeatedly traversing shared regions of morphospace appears commonplace in Radula, and means that many pairs of relatively unrelated species have similar lobule shapes. When observed over time, as in comparisons between fossil and extant species, this may give the impression of stasis if fossil species resemble modern species by chance, independent of their relatedness. This poses a challenge to relating fossils of known age to extant lineages, particularly when fossils are sterile. Significant rate variation between lineages was identified by Adams' Q-mode analysis, with the fastest subgenus evolving 23 times more quickly than the slowest. Species of subgenus Volutoradula and subgenus Metaradula are apparently over-dispersed throughout lobule morphospace according to Sidlauskas' method; morphometric branch lengths and hypervolumes in other subgenera can be explained by a stochastic process. In contrast, Bayesian analysis of macroevolutionary mixtures (BAMM) identified a single evolutionary rate as having the highest posterior probability. Consideration of the three independent accessions into auriculate lobule morphospace by Cladoradula and Radula, wherein convergent lobule shapes result from convergent lobule ontogenies and are correlated with bipinnately branched shoot systems and robust primary stems, leads to an ontogenetic hypothesis driven by structural requirements for light interception, under which auriculate lobules are a spandrel. It is speculated that lobules themselves, however, may be a key innovation facilitating radiation into microsites devoid of or depauperate in fungal endophytes. © 2015 The Linnean Society of London.
Wilson K.L.,Royal Botanic Gardens and Domain Trust
Taxon | Year: 2016
Revised procedures for the General Committee and the Permanent Nomenclatural Committees for particular groups are reported. Decisions are reported on: (1) two overlooked proposals from before the Melbourne Congress, one to conserve a name and the other to suppress a work; (2) thirty proposals to conserve and reject names recommended for acceptance in the Nomenclature Committee for Vascular Plants Report 64 and thirteen such proposals recommended for rejection in that Committee Report; (3) two conservation proposals for which the NCVP could not make a firm recommendation; (4) one recommendation from the NCVP to suppress a work; and (5) five recommendations from the NCVP on requests for binding decisions, four under Art. 38.4 (adequate description) and one under Art. 53.5 (parahomonymy). © International Association for Plant Taxonomy (IAPT) 2016.
Olde P.,Royal Botanic Gardens and Domain Trust
Acta Horticulturae | Year: 2015
The Hakeinae, a subtribe of Embothrieae, Proteaceae, consists of five genera, Buckinghamia, Opisthiolepis, Grevillea, Hakea and Finschia. The genera are discussed with respect to their suitability for horticulture and commerce. Particular reference is made to Buckinghamia celcissima, some new Grevillea cultivars, Grevillea 'Goliath' and Grevillea 'Bulli Beauty' and the Western Australian species (Grevillea eriobotrya) recently introduced to commercial use as cut flowers and garden subjects. Some observations are made on older cultivars, fertility, their cultivation, maintenance, breeding and utility as cut flowers or foliage.