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 Add this item to the list   Orcularia

General information

 Summary:Orcularia (Malme) Kalb & Giralt, Phytotaxa 38: 54 (2011) [MB#563558] 
 Synonymy:≡Rinodina sect. Ocularia G.O.A. Malme (1902) [MB#560682] 
 MycoBank #:563558 
 Authors:(Malme) Kalb & Giralt
 Authors (abbreviated):(Malme) Kalb & Giralt
 Page #:54
 Year of effective publication:2011
 Name type:Combination 
 Date public:2012-01-25 15:50:40 
 Name status:Legitimate
 Remarks:Malme (1902) introduced the name Orcularia as a section of Rinodina with R. insperata (Nyl.) Malme as the only Brazilian species. He distinguished section Orcularia from other sections of Rinodina by spore characters and the brown hypothecium. Sheard (1967) followed this scheme (op. cit.) and included an additional species, Rinodina biloculata (Nyl.) Sheard, in the section Orcularia.
The genus Orcularia shares some characters with Amandinea Choisy ex Scheidegger & H. Mayrhofer, namely the filiform conidia and apothecia with an initial pseudothalline margin, and Marbach (2000) actually transferred these species to Amandinea. However, the Orcularia-type ascospores and their ontogeny are very different from those occurring in Amandinea and unique within the Physciaceae, so that their placement in an independent genus seems more appropriate. Species belonging to Amandinea have Buellia-type ascospores (without any inner wall thickening) or Physconia-type ascospores (with inner wall thickenings ± pronounced only at the septum and also occasionally at the apices, although these are rather weak and are only observed briefly during the ascospore development). Physconia-type ascospores with a very thick septum and long and narrow lumina canals (= polarilocular) have often been called Orcularia-type (e.g. in Mayrhofer 1984). However, in the strict sense, Orcularia-type ascospores follow a different ontogeny than the Physconia-type and, at present, have only been observed in the taxa included in this contribution. In ascospores with Physconia-type ontogeny, the septum is inserted before any inner wall thickening appears whereas in Orcularia-type ascospores, the septum is inserted after lateral inner wall thickenings become distinct. Consequently, immature non-septate ascospores with pronounced lateral thickenings (with a single lumina ± bone-shaped) are common and very characteristic in the Orcularia-type (Fig. 1) but totally absent in the Physconia-type. Further the ascospore walls in Amandinea are often microrugulate or rugulate and become dark brown whereas in Orcularia they are always smooth and pale brown. The ± citriform shape of Orcularia ascospores with mucronate apices is also very characteristic.
Another genus with filiform conidia and polariloculate ascospores is Fluctua Marbach. But this genus differs in having pruinose apothecia with a distinct, thick, prominent and flexuous excipulum (somewhat lirelliform in appearance) which contains norstictic acid, a thallus containing norstictic acid, hardly thickened endcells of the paraphyses, and immature non-septate ascospores with subapical inner wall thickenings (Callispora-type ontogeny) and mature ascospores with subapical and septal inner wall thickenings (see Marbach 2000, Abb. 96: 211). In fact, Fluctua seems to be more closely related to Buellia s. str. (= Hafellia) from which it differs by the absence of hymenial oil droplets and the presence of filiform conidia.
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