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Ecology of the invading moss species Orthodontium linearein Sweden : substrate preference and interactions with other species / Lars Hedenäs in Journal of Bryology, vol. 15, n°3 (Année 1989)

Public [article]  inJournal of Bryology > vol. 15, n°3 (Année 1989) . - pp. 565-581 Titre : Ecology of the invading moss species Orthodontium linearein Sweden : substrate preference and interactions with other species Type de document : texte imprimé Auteurs : Lars Hedenäs, Auteur ; Tomas Herben, Auteur ; Rydin Hakan, Auteur ; Lars Söderström, Auteur Année de publication : 1989 Article en page(s) : pp. 565-581 Langues : Anglais (eng) Catégories : [ZG] Suède [Thèmes] Bryophytes [Thèmes] Ecologie Mots-clés : Orthodontium lineare Résumé : "In southern Sweden O. lineare grows in two main habitats, coastal pine forests and planted spruce forests. Within this area, the species colonizes the same kinds of substrate as in other climatically similar areas in Europe, viz. rotten wood, tree bases and, to a lesser degree, bare soil. Only a small proportion of the seemingly available substrate (0.2–8.3%) is colonized, a smaller proportion in the pine forests than in the spruce forests. DECORANA and TWINSPAN analyses of sociological data from random squares indicated that the association Orthodontietum linearis (Barkman) v. Hübschmann is heterogeneous and that its species composition varies considerably with the habitat. O. lineare seems to be competitively inferior compared with the species commonly found in its habitats and it probably survives in the area due to a high dispersal and colonization capacity." (source : auteurs) Type de publication : périodique Référence biblio : Hedenäs L., Herben T., Hakan R., Söderström L., 1989 - Ecology of the invading moss species Orthodontium linearein Sweden : substrate preference and interactions with other species. Journal of Bryology, 15 (3) : 565-581. ID PMB : 71740 DOI : 10.1179/jbr.1989.15.3.565 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71740 [article]

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Studies of protonemal morphogenesis in mosses, VIII. The gemmiferous protonemata of Orthodontium and Dicranoweisia / J. G. Duckett in Journal of Bryology, vol. 23, n°3 (Année 2001)

Public [article]  inJournal of Bryology > vol. 23, n°3 (Année 2001) . - pp. 181-193 Titre : Studies of protonemal morphogenesis in mosses, VIII. The gemmiferous protonemata of Orthodontium and Dicranoweisia Type de document : texte imprimé Auteurs : J. G. Duckett, Auteur ; J. A. Goode, Auteur ; H. W. Matcham, Auteur Année de publication : 2001 Article en page(s) : pp. 181-193 Langues : Anglais (eng) Catégories : [Thèmes] Bryophytes [Thèmes] Reproduction Mots-clés : Dicranoweisia cirrata  Orthodontium lineare Résumé : "This tribute to Alan Crundwell and Harold Whitehouse provides the first illustrated study of the development of gemmae in Dicranoweisia cirrata and Orthodontium lineare, and the first account of the gemmiferous protonema of O. gracile. Foliar and protonemal gemmae in D. cirrata are absent or sparse on nutrient-poor substrates and most abundant only on nutrient-rich barks. Development of gemmiferous protonemata in culture only on nutrient-rich medium underlines the field observations that gemma production is nutrient dependent. This may well be a reason why this species flourishes in polluted areas. In contrast, O. lineare produces gemmiferous protonemata on ail its natural substrates and nutrient dilution has little effect on their development in culture. D. antarctica and D. crispula, non-gemmiferous in nature, also failed to produce gemmae in culture. Unlike most moss gemmae, germination in D. cirrata is apolar. Orthodontium produces both terminal and intercalary gemmae, but only the former occur in Dicranoweisia. Detachment involves the formation of slightly elongate aplastidic tmema (abscission) cells in Dicranoweisia but either very short tmema cells or separation along the middle lamella akin to brood-cell liberation, in Orthüdontium. Experiments with activated charcoal and old media reveal that Dicranoweisia protonemata produce a substance that elicits gemma formation and inhibits their germination in situ. Protonemata of O. gracile are more prone to redifferentiate into thin-walled brood cells and are, therefore, probably more desiccation-sensitive than those of O. lineare. This may be a major reason why O. gracile is being over-run by the introduced species." (source : auteurs) Type de publication : périodique Référence biblio : Duckett J.-G., Goode J.-A., Matcham H.-W., 2001 - Studies of protonemal morphogenesis in mosses, VIII. The gemmiferous protonemata of Orthodontium and Dicranoweisia. Journal of Bryology, 23 (3) : 181-193. ID PMB : 71741 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71741 [article]

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Using nerve sections to separate Orthodontium gracile Schwaegr. ex Br. Eur. and O. line are Schwaegr. / R. D. Porley in Journal of Bryology, vol. 20, n°2 (Année 1998)

Public [article]  inJournal of Bryology > vol. 20, n°2 (Année 1998) . - pp. 500-501 Titre : Using nerve sections to separate Orthodontium gracile Schwaegr. ex Br. Eur. and O. line are Schwaegr. Type de document : texte imprimé Auteurs : R. D. Porley, Auteur Année de publication : 1998 Article en page(s) : pp. 500-501 Langues : Anglais (eng) Catégories : [ZG] FINISTERE (29) [ZG] Royaume-Uni et Irlande [Thèmes] Bryophytes [Thèmes] Morphologie végétale Mots-clés : Orthodontium gracile  Orthodontium lineare  comparaison d'espèce Résumé : "British bryologists have frequently experienced difficulty in separating Orthodontium gracile from the introduced O. lineare. Smith (1978) uses the sexuality of the plant and peristome characters. The first character is problematical since O. lineare can be heteroecious, and determining sexuality is not always easy. Furthermore, finding sporophytes at the appropriate stage of development is a serious limitation. Even when mature capsules are present, the endostome and upper segments of the exostome may have broken away, giving the impression of smooth peristome teeth, suggesting o. gracile. However, the lower (usually two) exostome segments of o. lineare are also smooth and I have seen errors in herbarium material as a result of this confusion." (source : auteur) Type de publication : périodique Référence biblio : Porley R.-D., 1998 - Using nerve sections to separate Orthodontium gracile Schwaegr. ex Br. Eur. and O. line are Schwaegr. Journal of Bryology, 20 (2) : 500-501. ID PMB : 71709 DOI : 10.1179/jbr.1998.20.2.500 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71709 [article]

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