1,721,036 research outputs found
The lowland cloud forest of French Guiana - a liverwort hotspot
No full textTropical lowland cloud forest (TLCF) occurs in moist river valleys in French Guiana, below 400 m, and has never been described. The forest resembles mixed lowland rain forest but differs by the frequent occurrence of fog and the abundance of epiphytes. Species richness of epiphytic liverworts in TLCF of French Guiana is similar to that at 2000 m in the Andes and is three times higher than in Amazonian lowland forest. The high species richness is explained by the favorable air moisture regime in TLCF, which allows these poikilohydric species to thrive in the hot lowland forest. Fog during day times prevents desiccation and allows the plants to reach net photosynthesis in spite of high temperatures. About thirty percent of the liverwort species in TLCF are restricted to the forest canopy and several are obligate epiphylls. Habitat preferences are similar to those in tropical montane cloud forest but taxonomic composition and total abundance are different. Dispersal by asexual reproduction is significantly more common in the forest understory than in the canopy, where dispersibility is less constrained. Canopy species have significantly wider ranges than understory species, presumably due to long range dispersal by spores
The lowland cloud forest of French Guiana - a liverwort hotspot
No full textTropical lowland cloud forest (TLCF) occurs in moist river valleys in French Guiana, below 400 m, and has never been described. The forest resembles mixed lowland rain forest but differs by the frequent occurrence of fog and the abundance of epiphytes. Species richness of epiphytic liverworts in TLCF of French Guiana is similar to that at 2000 m in the Andes and is three times higher than in Amazonian lowland forest. The high species richness is explained by the favorable air moisture regime in TLCF, which allows these poikilohydric species to thrive in the hot lowland forest. Fog during day times prevents desiccation and allows the plants to reach net photosynthesis in spite of high temperatures. About thirty percent of the liverwort species in TLCF are restricted to the forest canopy and several are obligate epiphylls. Habitat preferences are similar to those in tropical montane cloud forest but taxonomic composition and total abundance are different. Dispersal by asexual reproduction is significantly more common in the forest understory than in the canopy, where dispersibility is less constrained. Canopy species have significantly wider ranges than understory species, presumably due to long range dispersal by spores
Studies on the genus Thysananthus (Marchantiophyta: Lejeuneaceae) 1. Thysananthus discretus Sukkharak et Gradst. sp nov.
No full textThe liverwort, Thysananthus discretus Sukkharak et Gradst. sp. nov. (Lejeuneaceae) is described from Western Melanesia (New Guinea, Solomon Islands). The new species stands out within Thysananthus on account of the leaves when moist clasping the stem, free underleaf bases with the well-developed auricles, and the strongly rigid stems with 14-18 cells wide ventral merophytes.Royal Thai government German Academic Exchange Service (DAAD
Studies on the genus Thysananthus (Marchantiophyta: Lejeuneaceae) 1. Thysananthus discretus Sukkharak et Gradst. sp nov.
No full textThe liverwort, Thysananthus discretus Sukkharak et Gradst. sp. nov. (Lejeuneaceae) is described from Western Melanesia (New Guinea, Solomon Islands). The new species stands out within Thysananthus on account of the leaves when moist clasping the stem, free underleaf bases with the well-developed auricles, and the strongly rigid stems with 14-18 cells wide ventral merophytes.Royal Thai government German Academic Exchange Service (DAAD
A revision of Plagiochila sect. Crispatae and sect. Hypnoides (Hepaticae) in the Neotropics. I. Plagiochila disticha, P-montagnei and P-raddiana
No full textA revision of about 40 species and infraspecific taxa of Plagiochila sect. Crispatae Carl and sect. Hypnoides Carl from the Neotropics leads to the recognition of only three species, P disticha (Lehmann & Lindenb.) Lindenb., P montagnei Nees and P. raddiana Lindenb., all common and widespread at rather low elevations in tropical America. The species are fully described and illustrated. interpretations of P disticha and I! raddiana by Inoue (1989) appear to have been erroneous. Analysis of sporophytic and gametophytic characters shows that the two sections are morphologically very similar and should be treated as synonyms. Sect. Crispatae is proposed as the correct name of the group, estimated here to contain about ten species in the Neotropics. The position in the Crispatae of Plagiochila dubia Lindenb. & Gottsche, briefly described here with two new synonyms, remains uncertain by lack of sporophytes. The occurrence of the Crispatae in Africa seems to be restricted to It rudolfii Pocs as other African species placed in this section (Jones 1962) differ from the American taxa in branching pattern and elater structure
Bryophylogeny 2004 - Second International Symposium on the Molecular Systematics of Bryophytes
No full textCryptogamic epiphytes in primary and recovering upper montane oak forests of Costa Rica - species richness, community composition and ecology
No full textSpecies richness, community composition and ecology of cryptogamic epiphytes (bryophytes, macrolichens) were studied in upper montane primary, early secondary and late secondary oak forests of the Cordillera de Talamanca, Costa Rica. Canopy trees of Quercus copeyensis were sampled with the aim of getting insight in patterns and processes of epiphyte succession and recovery of diversity in secondary forest following forest clearing. Species richness of cryptogamic epiphytes in secondary and primary forests were nearly the same, showing that primary forests are not necessarily more diverse than secondary forests. High species richness of secondary forests was presumed due to the closed canopy, resulting in permanently high atmospheric humidity in these forests. Similarity in species composition of secondary and primary forests increases with forest age, but after 40 years of succession one third (46 species) of primary forest species had not re-established in the secondary forest. Community composition in primary and secondary forests differed markedly and indicates that a long time is needed for the re-establishment of microhabitats and re-invasion of species and communities adapted to differentiated niches. Genera and species exclusive to primary forests are relevant as indicator taxa and conservation targets. Forty percent (68 species) of all species recorded are restricted to secondary forests, indicating the important contribution of secondary forest diversity to total species richness of the oak forests of Costa Rica
On the occurrence of adnate underleaves and appendages in Thysananthus (Lejeuneaceae). Studies on the genus Thysananthus, 2.
No full textA revision of Plagiochila sect. Crispatae and sect. Hypnoides (Hepaticae) in the Neotropics. I. Plagiochila disticha, P-montagnei and P-raddiana
No full textA revision of about 40 species and infraspecific taxa of Plagiochila sect. Crispatae Carl and sect. Hypnoides Carl from the Neotropics leads to the recognition of only three species, P disticha (Lehmann & Lindenb.) Lindenb., P montagnei Nees and P. raddiana Lindenb., all common and widespread at rather low elevations in tropical America. The species are fully described and illustrated. interpretations of P disticha and I! raddiana by Inoue (1989) appear to have been erroneous. Analysis of sporophytic and gametophytic characters shows that the two sections are morphologically very similar and should be treated as synonyms. Sect. Crispatae is proposed as the correct name of the group, estimated here to contain about ten species in the Neotropics. The position in the Crispatae of Plagiochila dubia Lindenb. & Gottsche, briefly described here with two new synonyms, remains uncertain by lack of sporophytes. The occurrence of the Crispatae in Africa seems to be restricted to It rudolfii Pocs as other African species placed in this section (Jones 1962) differ from the American taxa in branching pattern and elater structure
On the occurrence of adnate underleaves and appendages in Thysananthus (Lejeuneaceae). Studies on the genus Thysananthus, 2.
No full text- …
