摘要:

AbstractA new species,Acaulon granulosum, is described from Victoria and Western Australia. It is compared with other species in theAcaulon muticumcomplex from which it differs in the larger spores with coarsely warty ornamentation, the costa excurrent in a reddish recurved cusp and the mostly larger lamina cells. A key to Australian smooth-celledAcaulonspecies is provided.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.257

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractC. nyholmiaeB.çetin is described as a new species from KöprülüCanyon National Park (Antalya) in Turkey. Its closest relative seems to beC. pachylomaSalm., from which it differs La. in having one row of guide cells throughout the leaf nerve, larger mid-leaf cells and leaves slightly twisted and spreading when dry.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.269

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.275

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractTwo species ofCololejeunea(Spruce) Schiffn. from Bhutan are described and figured as new to science:C.(subg.Cololejeunea)bhutanicaGrolle et Mizut. andC.(subg.Leptocoleasect.Goebelianae)longianaGrolle et Mizut.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.281

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractTwenty-five species of moss are recorded from the Nandi Hills, Mysore State.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.289

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractThirty-eight mosses are recorded from Kashmir, 10 apparently new to the state of Jammu and Kashmir.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.293

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractFissidens gymnogynusBesch.,F. mangarevensisMont. andF. obscurireteBroth. et Par. are reported new to the Philippine moss flora. Their discoveries greatly strengthen the continental Asiatic affinity of the local moss flora.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.299

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractExtensive cytological variation between British populations ofPellia endiviifolia(Dicks.) Dum. (n = 8+x/y) permits the recognition of six distinct karyotypes; one of them found also in Greece and another in the U.S.S.R. Although based on typically small amounts of constitutive heterochromatin, Giemsa C-banding patterns serve to identify each of three chromosomes, 1, 6 and 9, as dimorphic or polymorphic. Relative proportions of chromosomes differ between karyotypes and further variation relates toa nucleolar organiser region (NOR) on chromosome 6 of one population in addition to the NOR generally located in chromosome 7. These findings have repercussions intaxonomy and reproductive behaviour that are discussed in detail.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.303

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractAnnual growth rate and spore and capsule production was studied in 50 colonies of the epixylic hepatic,Ptilidium pulcherrimumin northern Sweden. Radial growth rate was independent of colony size but varied from year to year (mean value 5.2 mm year−1, range 3.5–6.3 mm year−1). Size at first sporophyte production was estimated to be 68 cm2and the age of first reproduction was estimated to be about 9 years. It was estimated that antheridia were formed the third year. No correlation between growth rates and reproduction was observed. Capsule density as well as capsule and spore production increased significantly with increased colony size. Differences between years in spore and capsule production (up to six-fold) were observed. The mean number of spores per capsule was 27 400 but significant differences between colonies (range from 18 000 to 44 000) were observed.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.315

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor

摘要:

AbstractThe germination and establishment abilities of different types of propagules under natural conditions is an area in bryophyte reproductive biology that is largely unknown. In some species gametophyte fragments, rather than spores, may be primarily responsible for establishment of new colonies in nature, and the presence of other mosses may have an effect on establishment processes. These ideas were tested experimentally using four species ofTortulagrown in a glasshouse under semi-natural conditions. The relative germination and growth abilities of spores and gametophytic fragments were tested under each combination of the following treatments: (1) continuous hydration (using a mist system), or periodic drying; (2) substrate of bare sand, a clump ofDicranum scoparium, or (for spores only) the clump ofTortulafrom which sporophytes were taken. Fragments produced new shoots much more quickly than spores under either hydration condition but spores germinated at a higher rate. Germination rates of both spores and fragments were greatly reduced (usually to zero) in clumps ofTortulaorDicranumunder either hydration condition. Some differences between species were noted. In a further experiment filter-sterilized water extracts of each species were applied to spores on agar. Again, strong effects on spore germination and protonemal growth were noted. Patterns of inhibition differed between species and reflected those found in the previous experiment, indicating that the inhibition effect may be due to a water soluble chemical rather than the physical properties of the moss clumps. These studies present the first experimental evidence for the chemical inhibition of spores by mature plants. When taken together with previous reports of chemical interactions among protonemal systems, considerable ecological significance of these results is suggested.

ISSN:0373-6687    

DOI:10.1179/jbr.1988.15.2.327

出版商:Taylor&Francis    

年代:1988

数据来源: Taylor