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 Add this item to the list  Hypoxylon rubroargillaceum
    

General information

 Summary:Hypoxylon rubroargillaceum Lar.N. Vassiljeva, S.L. Stephenson & K.D. Hyde, Fungal Diversity 55: 71 (2012) [MB#563308] 
 MycoBank #:563308 
 Epithet:rubroargillaceum 
 Rank:
 
 Authors:Lar.N. Vassiljeva, S.L. Stephenson & K.D. Hyde 
 Authors (abbreviated):Lar.N. Vassiljeva, S.L. Stephenson & K.D. Hyde 
 Literature:
 
 Page #:71 
 Year of effective publication:2012 
 Name type:Basionym 
 Gender:Neuter 
 Date public:2016-09-20 04:36:16 
 Name status:Legitimate 
 Remarks:This species is strikingly similar to H. flavoargillaceum J.H. Mill., which is known from two collections made in Colombia and Venezuela (Ju & Rogers 1996). It has the ascospores of the same size, a germ slit that extends the length of the spore, a perispore dehiscent in 10% KOH, glomerate stromata, similar KOH-extractable pigments, and even a clay-colored surface of the stromata, which is reflected in the Latin name 'argillaceum'. However, ascal tips in H. rubroargillaceum do not exhibit a bluing reaction in Melzer's iodine reagent and the granules immediately beneath the surface and between perithecia are not yellowish brown but bright-red. This bright color can be seen even from the surface (Fig. 10C), so the fungus from Thailand was named H. rubroargillaceum in contrast to H. flavoargillaceum. These two species could represent an instance of a vicarious biogeographical pattern, with one replacing the other in the two respective regions of the world (i.e., the Caribbean center of biodiversity and the Southeast Asia).
The stromata of H. rubroargillaceum are somewhat similar to the fungus illustrated as H. notatum Berk. & M.A. Curtis from northern Thailand (Phosri et al. 2008), and these two species are also similar in having glomerate stromata, comparable ascospore size, a perispore dehiscent in 10% KOH, a germ slit that extends the length of the spore, and an ascal apical ring that is highly reduced or lacking. The typical form of H. notatum seems to be restricted to Quercus spp. in the southeastern United States, but the species is indicated as being more widely distributed (Ju & Rogers 1996). Hypoxylon notatum is described as having dark brown granules beneath the stromatal surface and pure yellow KOH-extractable pigments with a greenish yellow tinge (Ju & Rogers 1996). We have already indicated that our specimens of H. notatum from the southeastern United States have an orange (or rusty) KOH-extractable pigment, as is also the case for the type specimen of H. notatum deposited in the Farlow Herbarium (on Quercus sp., Ravenel's Fungi Car. Exs. N 36)
 
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