摘要:

AbstractEvidence is presented for placingConardianear theWarnstorfia-Calliergonspecies in the Amblystegiaceae.

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.779

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractRadial growth of cushions ofLeucobryum glaucumwas studied by the crankwire method over two years in an oakwood at Mill Pond, Easthampstead, Berkshire. At this siteL. glaucumis the dominant ground flora species on acidic peat and forms some exceptionally large cushions (largest 2 m long, 1.5 m wide, 55 cm high). Growth was unrelated to initial cushion radius and proceeded at a similar rate on all faces of the cushions (overall average, 9.1 mm yr-1). Estimates of the age of the largest cushion range from sixty to eighty-four years depending on the radius measurement used. Growth rate was highest during the summer and autumn. It was unrelated to variations in precipitation but correlated strongly with air temperature, particularly accumulated temperatures (day-degrees) above 5°C. Evidence is discussed in support of the proposal thatL. glaucumis relatively thermophilic. The large cushions at Mill Pond probably result from a combination of favourable circumstances including the warm southern locality, the moist acidic soils, a humid sheltered microclimate and protection from disturbance.

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.785

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

AbstractOccurrence ofPtilidium pulcherrimumin transects and spore dispersal from a single colony have been studied in a coastal spruce forest in northern Sweden. The main substrate type was rotting wood with 75% of all occurrences. Annual spore production was 68,500 spores/m2forest, 640,000 spores/m2substrate and 44,000,000 spores/m2colony. Almost 50% of the spores were deposited within 2.5 m of the colony. Annual spore deposition between colonies was estimated to be between 24,000–39,000 and deposition on the main substrate, decaying logs, was about 340–600 spores/m2forest.P. pulcherrimumshowed a clumped distribution pattern up to about a 15 m neighbourhood distance. This pattern could not be explained by a similar clumping of the substrate. Instead a limitation by distance in establishment due to a deficit of spores is assumed.

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.793

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.803

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.805

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.806

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.809

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.811

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.813

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1989.15.4.833

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor