Mikronegeria alba (Uredinales)

Peterson, Roger S.; Oehrens, E

doi:10.2307/3759030

Cited by 9 publications

(6 citation statements)

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“…Shaw (1976) pointed to resemblances of C. peltatum aecia with those of Mikronegeria fagi Dietel & Neger on Araucaria in the andes. The spermogonia are also generally similar (type 12, Cummins & Hiratsuka 2003), but those of C. peltatum are not multilocular like those of the two known Mikronegeria species (Butin 1969;Peterson & oehrens 1978). ThatM.…”

Section: Discussionmentioning

confidence: 98%

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Mikronegeria fuchsiaesp. nov., a rust fungus onFuchsiaandPhyllocladusin New Zealand

Crane¹,

Peterson

2007

New Zealand Journal of Botany

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inoculations showed that two previously described rust fungi (Basidiomycota: Pucciniales), Caeoma peltatum on Phyllocladus spp. and Uredo fuchsiae on Fuchsia spp., both endemic to New Zealand, are different stages of a single species. Uredinial and telial states formed on Fuchsia excorticata after inoculation with aeciospores from Phyllocladus trichomanoides. The oblong teliospores form directly from subepidermal hyphae, then divide to become metabasidia, each cell of which germinates to form a long suprastomatal sterigma andbasidiospore. The rust closely resembles species in the family Mikronegeriaceae, and is named Mikronegeria fuchsiae sp. nov. This is the first record of a member of the Mikronegeriaceae in New Zealand.

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Section: Discussionmentioning

confidence: 98%

“…(Kakishima et al 1993) in Japan andM. alba oehrens & Peterson (Peterson & oehrens 1978) in the southern andes; and on Taxaceae, Caeoma torreyae in California, USa (Bonar 1951). infection of distantly related coniferophytes and the north-south and east-west hemispheric separations suggest great antiquity of this group (Peterson 1968).…”

Section: Taxonomymentioning

confidence: 99%

Mikronegeria fuchsiaesp. nov., a rust fungus onFuchsiaandPhyllocladusin New Zealand

Crane¹,

Peterson

2007

New Zealand Journal of Botany

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“…(Taxales: Taxaceae) (Bonar 1951). Two known teleomorphic rusts produce spermogonia on non-Pinaceae gymnosperms: Mikronegeria alba (Cupressaceae) and M. fagi (Dietel & Neger) Dietel (Araucariaceae) (Peterson and Oehrens 1978). Similarities in the simple spermogonia of these three taxa have been previously noted (Peterson and Oehrens 1978).…”

Section: Mikronegeriaceae Cummins and Hiratsmentioning

confidence: 90%

“…Instead of forming a distinguishable teliospore, M. alba produces metabasidia by apical elongation of simple, clavate probasidia (Peterson and Oehrens 1978). This simple mode of reproduction and the absence of conventional telio-spores has been interpreted as evidence to suggest this taxon shares more affinities with the Auriculariales than Uredinales (Peterson and Oehrens 1978), but other researchers suggest that morphologically simple short-cycled rusts are derived from the convergent influence of a secondarily tropical existence rather than indicative of "primitive" status (Savile 1978). Cummins and Hiratsuka (1983) created the monotypic Mikronegeriaceae to accommodate this unique taxon.…”

Section: Mikronegeriaceae Cummins and Hiratsmentioning

confidence: 99%

Toward resolving family-level relationships in rust fungi (Uredinales)

Aime

2006

Mycoscience

264

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Rust fungi (Basidiomycota, Uredinales) consist of more than 7000 species of obligate plant pathogens that possess some of the most complex life cycles in the Eumycota. Traditionally, a limited number of synapomorphic characters and incomplete life-cycle and hostspecificity data have hampered phylogenetic inference within the Uredinales. The application of modern molecular characters to rust systematics has been limited, and current contradictions, especially in the deeper nodes, have not yet been resolved. In this study, two nuclear rDNA genes (18S and 28S) were examined across the breadth of the Uredinales to resolve some systematic conflicts and provide a framework for further studies of the group. Three suborders of rusts are recovered. Of the 13 rust families most widely accepted, 8 are supported in full or in part (Coleosporiaceae, Melampsoraceae, Mikronegeriaceae, Phakopsoraceae p.p., Phragmidiaceae, Pileolariaceae, Pucciniaceae, Raveneliaceae), 3 are redundant (Cronartiaceae, Pucciniastraceae, Pucciniosiraceae), and the status of 2 (Chaconiaceae, Uropyxidaceae) could not be resolved. The Mikronegeriaceae and Caeoma torreyae are the most basal rusts sampled. It is concluded that morphology alone is a poor predictor of rust relationships at most levels. Host selection, on the other hand, has played a significant role in rust evolution.

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“…The inclusion of Exobasidium with thin-walled teliobasidia will not be an exception, since thin-walled teliobasidia are found in a number of rusts. Peterson and Oehrens (1978) have pointed out that there are several genera of rusts whose teliospores are so poorly defined that they might be said not to exist. This has often resulted in confusion as to the limits of the Uredinales and Auriculariales.…”

mentioning

confidence: 97%