saxicolous


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saxicolous

[sak′sik·ə·ləs]
(ecology)
Living or growing among rocks.
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Saxicolous lichens could adapt more harsh conditions than those colonizing on other media because bare rock surface is extraordinarily oligotrophic, dry in most time of the year and irradiated strongly by ultraviolet.
in a saxicolous habitat at Tres Pontoes (20[grados]04' S, 41[grados]02' W), located in the municipality of Afonso Claudio, Espirito Santo State, southeastern Brazil.
This saxicolous species is characterized by its 3-4-pinnate, paniculate, red inflorescences, with spikes 40 cm long, red floral bracts, erect or sub erect, not imbricate, pedicellate flowers and sepals 3 mm connate.
The substrates upon which each lichen was growing were also noted: terricolous (clay or soil), saxicolous (concrete, dolomite, or granite), corticolous (the bark of trees or shrubs), lignicolous (wood or decorticate logs) or other (rusted metal, animal bones, fungi, mosses, etc.
Communities of: Larrea cuneifolia, Larrea divaricata, Baccharis salicifolia and Hyalis argentea were determined, as well as Mimulus glabratus and Eleocharis albibracteata in streamflows, Chuquiraga erinacea, Adesmia retrofracta and Stipa cordobensis on Tertiary soils, the saxicolous community on rocky outcrops, and grasslands of Stipa ichu and Stipa tenuissima.
This species is parasitic in the apothecia of saxicolous taxa of Lecidella and is usually collected accidentally in association with collection of the host lichen.
Collections of saxicolous lichens were restricted to those on pebbles or small stones.
Cattle dung causes a nutrient invasion in the originally poor soils, which triggers invasions by c-strategist plants such as the African molasses grass (Melinis minutiflora P Beauv), which ultimately outcompete and eliminate the native r-strategists, and connect previously isolated saxicolous vegetation stands during fires.
Succulents, cacti, afilos, saxicolous and rupicolous and epiphytic plants vegetation are common.