Observations on two rhizomorph-forming species of Marasmiellus

Desjardin, Dennis E.; Gordon, Scott; Petersen, Ronald H.

doi:10.1016/s0953-7562(09)81147-7

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…Considering that other species of Marasmiellus have been reported as tetrapolar (Desjardin et al 1993;Lamoure 1989;Petersen 1997;Petersen and Gordon 1994), discovery of tetrapolarity in M. juniperinus was expected. Nonetheless, no bipolar or amphithallic taxa of Marasmiellus have yet been reported, even though such mating behaviors might be expected in tropical agarics, for which rapid colonization and reproductive escape are advantages.…”

Section: Discussionmentioning

confidence: 96%

Phylogenetic placement of Marasmiellus juniperinus

2004

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Recent collections and the type specimen of Marasmiellus juniperinus, the type species of the genus, were examined. Phylogenetic placement, based on ribosomal large subunit (LSU) and internally transcribed spacer (ITS) sequences, is within the lentinuloid clade, nested among Gymnopus taxa. This placement dictates genus name usage and phylogenetic position of other putative species of Marasmiellus. The mating system is tetrapolar.

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Section: Discussionmentioning

confidence: 96%

Phylogenetic placement of Marasmiellus juniperinus

2004

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“…appalachianus Desjardin together with Ma. opacus (see Desjardin et al 1993: figs 10-16) in subsect. Opacini, although pileipellis structures are quite different.…”

Section: Pileus Disc Pileipellismentioning

confidence: 99%

“…opacus thus far (Desjardin et al 1993) the following was reported: " Features diagnostic for M. opacus include: (a) convex, rugulose-striate pileus colored pale greyish brown on the disc and white on the margin; (b) subdistant, narrow, white to buff-coloured lamellae; (c) pubescent, insititious stipe with pallid apex and brownish grey base; (d) buff or pale greyish brown rhizomorphs; (e) basidiospore mean of 8.3 × 3.7 µm; (f ) diverticulate cheilocystidia; (g) pileus disc with clavate to sphaeropedunculate, often thick-walled terminal cells, and pileus margin a Rameales-structure; (h) caulocystidia similar to pileipellis elements; (i) clamped, inamyloid hyphae; and (j) fructification on leaves and wood of Rhododendron, Quercus and Tsuga." This diagnosis, however, was compiled to distinguish Ma.…”

Section: Pileus Disc Pileipellismentioning

confidence: 99%

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An investigation on Mycetinis (Euagarics, Basidiomycota)

Petersen¹,

Hughes²

2017

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Molecular analyses have revealed a clade which equates with the genus name Mycetinis Earle. An overall survey of this genus, however, has not been forthcoming. The current study summarizes taxa which are placed in Mycetinis based on morphological and/or molecular data. Fifteen taxa are accepted: Mycetinis scorodonius f. diminutivus and Mycetinis yunnanensis are proposed as new, while Mycetinis cinnamomeus, Mycetinis olidus, Mycetinis prasiosmus, Mycetinis subalpinus and Myctinis virgultorum are newly recombined binomials. Phylogenies based on molecular data show overall disposition in Omphalotaceae, Gymnopus and allied genera, and taxa of Mycetinis.

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“…Single strand isolations were made from the mycelial strands onto water agar plates and subsequently onto Potato Dextrose Agar (PDA) media. Pure cultures of the isolates were observed under light microscope (Leica, USA) and identification based on morphological characteristics using standard references (Singer, 1986;Humber, 2005;Kirk et al, 2008;Desjardin et al, 1993). Pathogenicity test was conducted on healthy cocoa leaves (3-months old) from mixed cocoa hybrids.…”

Section: Fungi Isolation Identification and Pathogenicity Testingmentioning

confidence: 99%

White thread blight disease caused by Marasmiellus scandens (Massee) Dennis Reid on cocoa and its control in Ghana

Amoako-Attah¹,

Akrofi²,

Hakeem³

et al. 2016

Afr. J. Agric. Res.

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White thread blight disease (WTBD) is currently emerging as an important foliar disease on cocoa in Ghana. The disease has been known in the country for many years. Yet, the incidence and severity levels on cocoa in the growing regions are not known. Surveys and sampling were conducted between 2011 and 2013 to estimate incidence and severity of WTBD in the six cocoa growing regions (Ashanti, Brong-Ahafo, Central, Eastern, Western and Volta) of Ghana. Diseased samples were assayed for the infecting fungus and its identification. Chi square tests were used to find relationships between age, sanitation practice and the disease severity. Effectiveness of chemical and cultural control methods against the disease were tested. The disease was found in all the cocoa growing regions of Ghana and out of 24,000 trees inspected, 1,281 (5.3%) were infected. The majority of infected trees (74.2%) were moderately affected but 3.2% of the trees were very severely affected and almost dead. A positive correlation (r = 0.889) was found between WTBD incidence and the severity. The most severely affected regions were Ashanti (13.8%), Brong-Ahafo (10.2%) and Western (7.6%) regions. Poor maintenance significantly (p=0.0001) increased the levels of disease occurrence and severity. Older cocoa trees also appeared more susceptible than younger ones. Pruning of affected branches controlled the disease better than fungicides spray. However, Nordox (75% copper (I) oxide) at 5 g/l and Metalm (12% metalaxyl and (60% copper (I) oxide) at 3.3 g/l fungicides were effective in reducing mycelial growth of the Marasmiellus fungus. Therefore, fungicide should be used in situations of severe infection to supplement pruning.

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Observations on two rhizomorph-forming species of Marasmiellus

Cited by 9 publications

References 18 publications

Phylogenetic placement of Marasmiellus juniperinus

Phylogenetic placement of Marasmiellus juniperinus

An investigation on Mycetinis (Euagarics, Basidiomycota)

White thread blight disease caused by Marasmiellus scandens (Massee) Dennis Reid on cocoa and its control in Ghana

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