The Merosporangiferous Mucorales

Benjamin, R. K.

doi:10.5642/aliso.19590402.05

Cited by 144 publications

(86 citation statements)

References 22 publications

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“…The light microscopical observations reported for the Dimargaritaceae (Benjamin, 1959(Benjamin, , 1961(Benjamin, , 1963(Benjamin, , 1966Benny, 1972), allied with the ultrastructural observations presented in this paper for Dimargaris cristalligena and Tieghemiomyces californicus, substantiate the idea that the complex septum, essentially comprising a pore with a plug and associated bodies, is characteristic of these fungi.…”

Section: Discussionsupporting

confidence: 65%

“…Moss & Young (1 978), however, would exclude the Dimargaritaceae from the Kickxellales on several grounds and Dr R. K. Benjamin currently plans to validate the Kickxellales for the Kickxellaceae and the Dimargaritales for the Dimargaritaceae, respectively (personal communication). In these families, although the morphology of the cross-wall is basically similar (Benjamin, 1959;Young, 1969;Benny & Aldrich, 1975), septal plugs of the Kickxellaceae lack associated globose bodies and they are insoluble in dilute alkali whereas those of the Dimargaritaceae are soluble. The kickxellaceous cross-wall (Young, 1969) is indistinguishable from that found in the Harpellales and Asellariales (Farr & Lichtwardt, 1967;Reichle & Lichtwardt, 1972;Moss, 1975;Moss & Young, 1978) and the indications are that the Kickxellaceae are more likely to be closely related to the Harpellales and Asellariales (Lichtwardt, 1973 ;Moss & Young, 1978) than to the Dimargaritaceae.…”

Section: Discussionmentioning

confidence: 99%

“…At the limit of resolution of the light microscope, the central region of the cross-wall appears swollen and a central lenticular structure is discernible, bordered on each side of the septum by a globose body (Figs 1, 2). The sporangiophore cross-wall, first described by Benjamin (1959) and investigated histochemically by Benny (1972), differs structurally from that of the vegetative hyphae as only the upper lobe of the septal plug is globose, the lower being obconic (Benjamin, 1959;and Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

“…1) which more closely resembles the dolipore-parenthesome septum of Basidiomycotina in this respect. Benjamin's elegant demonstration of zygospore production in several members of the Dimargaritaceae (Benjamin, 1959) fully justifies their inclusion in the Zygomycotina although the complex nature of the septa does raise the question of the affinity of these fungi to other members of the Zygomycotina.…”

Section: Discussionmentioning

confidence: 99%

“…The family Dimargaritaceae, classified initially in the Mucorales (Benjamin, 1959), was transferred together with the Kickxellaceae to the Kickxellales (Kreisel, 1969). Moss & Young (1 978), however, would exclude the Dimargaritaceae from the Kickxellales on several grounds and Dr R. K. Benjamin currently plans to validate the Kickxellales for the Kickxellaceae and the Dimargaritales for the Dimargaritaceae, respectively (personal communication).…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of Septa in Dimargaris cristalligena R. K. Benjamin

Jeffries

Young

1979

Journal of General Microbiology

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The fine structure of the septum in the vegetative hypha of the mycoparasite Dimargaris cristalligena is described. The cross-wall, continuous with the inner electron-lucent layer of the hyphal wall, bears a central pore with a flared margin occupied by a biumbonate electron-dense plug. A globose body, surrounded by a zone of ribosome-free cytoplasm, is situated next to the septal pore on each side of the cross-wall. In the neck of the haustorium, a globose body is normally observed only on that side of the septal pore next to the appressorium. Globose bodies appear structureless ; they are electron-dense when fixed in potassium permanganate and of variable electron density in aldehyde-osmium fixations. Cytoplasmic continuity is maintained through the septal pore by the plasmalemma. In the sporangiophore and sporiferous branchlets, the septal plug bears an upper globose protuberance and a lower obconic one. The hyphal septum in Tiegherniomyces californicus is ultrastructurally similar to that of D. cristalligena. The possible functional and taxonomic significance of such septa is indicated. I N T R O D U C T I O NDimargaris cristalligena, like other species in the genus, is parasitic on members of the Mucorales. Characteristically, it produces two-spored merosporangia and the hyphae are regularly septate. Liberated sporangiospores germinate on nutrient agar and the mycelium may make weak saprophytic growth in the absence of the host. Complex septa are produced in the mycelium, typically having a cross-wall with a flared central pore occluded by a plug, and usually with a spherical body on each side of the plug (Benjamin, 1959). Although the distinctive form of the septum found in the vegetative hyphae, as observed in the light microscope, is used as a diagnostic character of the Dimargaritaceae, the fine structure of such septa has not been described. Ultrastructural studies of septa (e.g. Moore & McAlear, 1962 ;Moore, 1965 ;MOSS, 1975 ;Khan, 1976) have provided substantial information supporting taxonomic relationships. The aim of this paper is to describe the fine structure of the septum of the vegetative hypha of D. cristalligena, with notes on the sporangiophore septum and on a related species Tieghenziomyces californicus, for comparison with other known forms of septa. METHODS Organisms

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of Septa in Dimargaris cristalligena R. K. Benjamin

Jeffries

Young

1979

Journal of General Microbiology

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On the origin of feces: Fungal diversity, distribution, and conservation implications from feces of small mammals

et al. 2022

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Kingdom Fungi is extremely diverse and ubiquitous across the globe, with ~148,000 currently accepted species known from the estimated 2.2-12 million species distributed on all continents and in most aquatic habitats (Hawksworth & Lücking, 2017;Wu et al., 2019). Documentation of fungal diversity has lagged far behind that of other groups of multicellular organisms, largely due to their generally cryptic habits and their unpredictable production of ephemeral macroscopic sporocarps, resulting in a severe bias in biodiversity knowledge towards plants and animals (Troudet et al., 2017). Recent technological advances such as molecular identification with highthroughput sequencing have made it possible to document fungal diversity indirectly from environmental samples, greatly accelerating the rate at which fungi can be detected and identified (Begerow

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A New Species of Syncephalis (Mucorales)

Embree

1965

American J of Botany

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The Merosporangiferous Mucorales

Cited by 144 publications

References 22 publications

Ultrastructure of Septa in Dimargaris cristalligena R. K. Benjamin

Ultrastructure of Septa in Dimargaris cristalligena R. K. Benjamin

On the origin of feces: Fungal diversity, distribution, and conservation implications from feces of small mammals

A New Species of Syncephalis (Mucorales)

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