摘要:

AbstractScapania lingulatais reported from five vice-counties in Scotland and from one in Ireland, two gatherings bearing♂shoots and one with perianths. It differs fromS. scandicain its larger gemmae, fromS. praetervisain its broadly rounded postical leaf lobes, and from both species in its larger leaf cells, more numerous oil bodies and polyploid chromosome complement. Usually it grows on base-deficient earthy banks but also on base-rich rock ledges.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.399

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractScapania paludicolais reported fromSphagnumbogs in E. Cornwall and Midwest Yorkshire. It differs fromS. irriguain its shorter, strongly arched keel, ovate-cordate, appressed antical leaf lobes with the base often extending below the level of the keel, and in the pink or purplish red mature gemmae.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.405

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.409

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractThe genusPellia, with three currently recognised species, includes a relatively primitive taxon,P. endiviifolia, in which the perichaetium is high and incised, with an enclosed calyptra. It is dioecious, produces anthocyanin wall pigments in exposed sites, reproduces asexually by repeatedly furcate, narrow fragmenting‘autumnal innovations’, is freely branched and has relatively small spores. A species previously confused with this taxon, and here described asP. megaspora, is an endemic boreal American species, found from New York, Connecticut and Massachusetts north to Newfoundland and west to Minnesota. The plant has a tall perichaetium that is strikingly incised-ciliate to lacerate. It is dioecious but does not produce wall pigments and autumnal innovations, is simple or oncefurcate and has extremely large spores. Cytological and biochemical data support the specific recognition ofP. megaspora.Biochemical data also suggest that Japanese populations currently assigned toP. endiviifoliaare distinct and field observation suggests that these plants may represent an autonomous subspecies.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.411

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractA unique karyotype within the genusPellia, both in terms of chromosome structure and in the distribution of heterochromatin as defined by Giemsa C-banding, supports the taxonomic recognition ofP. megaspora.ResemblingP. endiviifoliamore closely thanP. epiphyllaorP. neesianain its heterochromatin content, the species differs significantly in karyotype symmetry and the absence of an m-chromosome. Comparison ofP. endiviifoliafrom Britain, Japan and Canada has identified clear and extensive evidence of cytological polymorphism.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.433

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractStudies of the relative and absolute lengths of mitotic chromosomes show thatPellia endiviifoliais cytologically distinct from the speciesP. megaspora, P. epiphyllaandP. neesiana.This supports the recognition, on morphological grounds, ofP. megasporaas a species distinct fromP. endiviifolia.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.441

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractThere are two groups ofPelliaperoxidase isozyme phenotypes, one composed ofP. epiphylla, P. neesianaandP. borealis, the other ofP. endiviifoliafrom Europe,P. endiviifoliafrom Japan andP. megaspora.The phenotypes within the second group differ supporting the suggestion that there are three taxa present.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.447

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractA new species,Notothylas himalayensisUdar et Singh is described from India. The species is remarkable in usually having erect plants with radially symmetrical basal stalk. Of particular significance is the presence of sinuate or nodulose radial wall thickenings in the epidermal cells of the capsule wall, usually with an additional plate-like thickening extending to transverse and outer tangential walls. The plants are further characterised by the presence of tetrahedral as well as tetragonal spore tetrads; deep brown spores with finely vermiculate exine ornamentation and a smooth or wavy flange. The vermiculae ramify to form reticulations as revealed under SEM apart from some larger lamellar structures sporadically distributed on the surface. The pseudoelaters have prominent spiral or semiannular thickening bands.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.451

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractSporelings ofLejeunea caespitosaLindenb. usually form a primary protonema of a single row of four cells, and a secondary protonema at first of two rows, and eventually of four rows of cells. The juvenile stem with two dorsal and three ventral rows of cells produces simple undivided underleaves and elobulate primary leaves or, later, lobulate juvenile leaves of which well developed lobules nearly equal the lobes in size. Bifid underleaves are formed as soon as the stem acquires four ventral rows of cells.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.459

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractA lamellate paraphyllium on the dorsal side of the shoots inBrachiolejeunea laxifoliais described and its origin discussed. It is probably a useful species character, unique in the Lejeuneaceae.

ISSN:0373-6687    

DOI:10.1179/jbr.1981.11.3.463

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor