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 Add this item to the list  Verrucaria corallensis

General information

 Summary:Verrucaria corallensis P.M. McCarthy, Australasian Lichenology 63: 17 (2008) [MB#513129] 
 MycoBank #:513129 
 Authors:P.M. McCarthy 
 Authors (abbreviated):P.M. McCarthy 
 Page #:17 
 Year of effective publication:2008 
 Date public:2009-03-17 22:36:12 
 Remarks:Marine and maritime species of Verrucaria are especially diverse and abundant at cool-temperate and even colder latitudes. Six intertidal species are known from Australia: V. halizoa Leight., V. maura Wahlenb., V. meridionalis P.M.McCarthy, V. microsporoides Nyl., V. striatula Wahlenb. and V. subdiscreta P.M.McCarthy (McCarthy 2001). These are commonly subjected to wave or splash action, but they are rarely if ever submerged for longer periods. Intertidal species of Verrucaria appear to be very uncommon in the tropics, presumably due to their inability to tolerate the extremes of saturation and desiccation on tropical coasts, possibly further complicated by daily wet-season downpours of rainwater. Only one species was known previously from coastal Queensland, i.e. V. halizoa, which was collected by R.W.Rogers from coral at Heron Island on the southern Great Barrier Reef.
Verrucaria corallensis is characterised by a very thin, green to blackish thallus with minute, carbonaceous dots (punctae) and ridges (jugae), small but prominent perithecia and unusually elongate ascospores. The pantemperate V. striatula is the only other Australian taxon with thalline ridges. However, that species has a continuous to rimose thallus, and its ascospores are ellipsoid to subglobose and 7–11 × 4–7 µm (McCarthy 2001). The thallus of V. subdiscreta is usually areolate and minutely punctate, the ascomata are smaller, and the ascospores, although often rather elongate, are significantly smaller than those of V. corallensis (9–15 × 4.0–6.5 µm; McCarthy 2001). Verrucaria halizoa, the other marine species known from Queensland, lacks punctae and jugae and produces ascospores measuring 7.5–12.0 × 4.5–6.5 µm (McCarthy 2001), while the European V. amphibia R.Clem. has a thallus and carbonaceous ridges rather similar to those of V. corallensis, but the former has 0.4–0.5 mm diam. perithecia and 7–10 µm wide ascospores (Hawksworth et al. 1992).
The new lichen is known only from the type locality in north-eastern Queensland, where it was abundant on a large sandstone outcrop on a beach near Rocky Point; the outcrop was partly inundated and heavily splashed at high tide. Although no other lichens were were found at this site, the new species grew on moderately shaded surfaces adjacent to blackish, crustose Rhodophyta, crustose Corallinaceae (Rhodophyta) and a species of Ralfsia s. lat. (Phaeophyta). Several barnacles were also seen at the same vertical level on the outcrop.
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