Histochemical Observations on the Discomycete,<i>Pyronema Domesticum</i>, with Special Reference to Apothecial Ontogeny

Moore-Landecker, Elizabeth

doi:10.1080/00275514.1981.12021347

Cited by 3 publications

(3 citation statements)

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“…in excipular cell walls of some ascomycetes, but the existence of these has not yet been confirmed with electron microscopy. The same applies to the minute pores that have been observed with light microscopy in excipular hyphae of Pyronema domesticum (Moore-Landecker 1981). However, the existence of protein channels or structural cables in cell walls is involved in one of the three potential non-exclusive mechanisms of transit across cell walls, as postulated by Brown et al (2015).…”

Section: Gel Formationmentioning

confidence: 85%

“…Besides pyrenomycetes (see above) also many discomycetes are known to have extracellular gel in their hymenium, especially around the paraphyses, e.g., species of the genera Claussenomyces and Chloroscypha (Dennis 1956b;Carpenter 1981). In apothecia of Pyronema domesticum, Moore-Landecker (1981) found droplets of mucilage on the surface of paraphyses. She was probably the first who determined that these droplets were formed by secretion.…”

Section: Gel Formationmentioning

confidence: 98%

“…Afterwards, Korf (1973) added to the conventional seven textura types a "textura intricata" with "hyphae widely spaced and immersed in a gel" and a "gelatinized tissue, appearing to have widely spaced, parallel, thin-walled hyphae probably arising by gelatinization of the thick walls of an earlier textura oblita", and depicted them. Similarly, Breitenbach and Kränzlin Observed with LM in conidiophores of "Coryne" (Ascocoryne) cylichnium (Moore 1965c) Observed with LM in Pseudohydnum gelatinosum (Moore 1965c) Likely in paraphysoids of pyrenomycetes (Döbbeler 1978 Observed with TEM in Candida albicans and parapsilosis, Histoplasma capsulatum, Saccharomyces cerevisiae, and Sporothrix schenckii (Albuquerque et al 2008) Observed with TEM in Cryptococcus neoformans (e.g., Rodrigues et al 2007) Observed in paraphyses of Pyronema domesticum (Moore-Landecker 1981) Suggested for Malassezia sympodialis (Gehrmann et al 2011) Suggested for Paracoccidioides brasiliensis (Vallejo et al 2012) (1981: Abb. 7, bottom figure) give a diagram of "gelatinisiertes Gewebe" with thin, winding hyphae surrounded by gel.…”

Section: Gelatinous and Incrassate Derivations Of Basic Tissue Typesmentioning

confidence: 99%

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Emendations to tissue typology in discomycetes

Hengstmengel

2020

Mycol Progress

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The term "textura oblita", referring to a tissue type in ascomycetes with apothecial ascomata, has caused much confusion to ascomycologists. Originally it was defined as a long-celled tissue type consisting of thick-walled hyphae with intercellular substance. However, this definition appeared not well, or not at all, applicable to the originally given examples like Phialea starbaeckii. This has resulted in two other definitions which are more or less the opposite of each other, viz. as a thick-walled tissue with gelatinized walls and as a thin-walled tissue embedded in a gelatinous matrix. The main issue is the location of the gelatinous substance in the relevant tissue: in the cell wall, extracellular, or both. Unfortunately all of the three tissues are called "gelatinous tissue", although the term "gelatinous tissue" according to its definition concerns only tissue with extrahyphal gel. This implies that essential information about the location of the gel is ignored. In effect, all three conceptions of textura oblita are reducible to versions of textura porrecta that differ in the location of the gel. Similarly other tissue types can occur in different versions. The author discusses the postulated mechanisms of gel formation in fungal tissues. These concern disintegration of the outer layer(s) of hyphal walls, disintegration of hyphae, and secretion, here linked to exocytosis. There is supposed to be a correlation between the way of gel formation on the one hand, and the structure of the sporocarp and the cell wall in ascomycetes and basidiomycetes on the other hand. To conclude, an emended tissue typology is provided in which the distinguished versions of the six basic tissue types are arranged according to the shape of their cells, the arrangement of their hyphae, the occurrence of thickened cell walls, and the occurrence of extracellular gel. The species name Cyathicula starbaeckii, comb. nov., is validly published here.

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Section: Gel Formationmentioning

confidence: 85%

Section: Gel Formationmentioning

confidence: 98%