Geeta Asthana; S. C. Srivastava:

Indian Cololejeunea

A taxonomic study

2003. VIII, 155 pages, 53 plates, 1 map, 14x23cm, 330 g
Language: English

(Bryophytorum Bibliotheca, Band 60)

ISBN 978-3-443-62032-5, paperback, price: 70.00 €

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bryophyte Cololejeunea liverwort India


Preface top ↑

Cololejeunea is one of the most delicate liverworts occurring all over the world in a variety of habitats, yet it is poorly understood probably due to the small size of the plants, the specialized habitats, and quite often due to lack of adequate material. The genus represents a heterogeneous assemblage of plants and has been variously defined by most of the workers, who recognized various taxa assigning generic and/or subgeneric ranks down to the level of sections. Our knowledge of Indian Cololejeuneas is mostly fragmentary and the plants have never been critically investigated. At the suggestion of the late Professor Ram Udar, an effort has been made to compile all information, sporadically given by different authors, in one place along with treatment of the many undescribed species of the country. The authors believe that the present work will certainly fill the gap in this field and provide a guideline for future work.

This account reviews past and present concepts of the genus, the systematic position of the genus and its family, and a detailed taxonomic account of the 30 Indian species in the light of modern taxonomic parameters, with a description of morphological diversity, geographical distribution, supplemented with plates, tables and maps. All the figures are drawn by one of the authors (GA).

Summary top ↑

The present study on Cololejeunea (Spruce) Schiffn. includes the taxonomic treatment of 30 species recognized in the Indian subcontinent, in the following six subgenera: Aphanolejeunea (Evans) Benedix [4 species], Chlorolejeunea Benedix [I species], Cololejeunea Spruce [5 species], Leptocolea (Spruce) Schiffn. [6 species], Pedinolejeunea Benedix ex Mizut. [11 species] and Taeniolejeunea (Zwickel) Benedix [3 species]. It includes Cololejeunea (Aphanolejeunea) truncatifolia (Horik.) Mizut., C. (A.?) hyalina sp. nov., C. (A.) karnatakensis sp. nov., C. (A.) nilgiriensis sp. nov., C. (Chlorolejeunea) madothecoides (Steph.) Benedix, C. (Cololejeunea) jelinekii Steph., C.(C.) haskarliana (Lehm. & Lindenb.) Schiffn., C. (C.) mizutaniana Udar & Srivastava, C. (C.) pseudoplagio-phylla Wu & Lou, C. (C.) spinosa (Horik.) Pandé & Misra, C. (Leptocolea) ceylanica Onraedt, C. (L.) gottschei (Steph.) Mizut., C. (L.) trichomanis (Gottsche) Steph., C. (L.) longifolia (Mitt.) Benedix ex Mizut., C. (L.) minutissima (Smith) Schiffn., C. (L.) siangensis sp. nov., C. (Pedindolejeunea) cardiocarpa (Mont.) Evans, C. (P.) ceratilobula (Chen) Schust., C. (P.) foliicola Srivastava & Srivastava, C. (P.) furcilobulata (Berrie & Jones) Schust., C. (P.) latilobula (Herzog) Tixier, C. (P.) kashyapii Udar & Srivastava, C. (P.) lanciloba Steph., C. (P.) planissima (Mitt.) Abeyw., C. (P.) producta (Mitt.) Hatt., C. (P.) sigmoidea Jovet-Ast & Tixier, C. (P.) udarii sp. nov., C. (Taeniolejeunea) appressa (Evans) Benedix, C. (T.) floccosa (Lehm. & Lindenb.) Schiffn. and C. (T.) pseudo-floccosa (Horik.) Benedix. Of these, five species are new to science and six species: C. truncatifolia, C. ceratilobula, C. latilobula, C. ceylanica, C. trichomanis and C. floccosa, are new records for India.

The subgenus Aphanolejeunea is mainly characterized by the fragile nature of the plants, distantly arranged leaves often with dimorphic lobules, Aphanolejeunea-type of lobular teeth and Aphanolejeunea-type branching. The subgenus Chlorolejeunea is mainly characterized by a massive type of stem anatomy (17 + 7) in contrast to the highly reduced stem anatomy (5 + 1) of the genus. The subgenus Cololejeunea is mainly characterized by well developed dorsal papillosity on the leaf-cells.

The subgenus Leptocolea is mainly characterized by the crenate or dentate leaf-lobe margin and leaf-cells being usually without dorsal papillosity (when present, restricted to marginal leaf-cells or younger portion of the plants only). The subgenus Pedinolejeunea is mainly characterized by dimorphic leaf-cells (chlorophyllous and hyaline: rectangulate, elongated or linear-flexuose) and ligulate lobule with apical hyaline papilla.

The subgenus Taeniolejeunea is mainly characterized by the presence of ocelli, forming a vitta.

This work incorporates a review of the past and present status of Cololejeunea, the previous work done by different authors, taxonomic parameters used for delimiting the species, morphological descriptions of the genus Cololejeunea, its subgenera as well as species and keys to segregate subgeneric groups and species. It also includes relevant synonymy, characteristics of the species, full references to the specimens examined, geographical distribution, notes on ecology and a discussion to highlight the specific differences, affinities and elucidation of those features which have not been taken into consideration so far. The work is supplemented with 44 plates of line drawings, 9 photoplates, including LM & SEM photographs. Besides, three tables, showing the past and present status of genus Cololejeunea, its subgenera as well as its Indian species have been provided. An additional table showing the distribution of 30 species within the Indian subcontinent along with their habitats has also been provided. Cololejeunea is a tropical-subtropical genus and preferentially grows on living leaves. Other habitat preferences are bark, rock and earth. In the Indian subcontinent, southern India is the richest territory with 23 species followed by the east Himalayan territory with 17 species and then the west Himalayan territory with two species. Central India has the poorest Cololejeunea flora, with only single species, (C. latilobula) which is also known from southern India, eastern and western Himalayas.

Contents top ↑

Preface VII
Acknowledgements VIII
Summary 1
Introduction 3
Material and Methods 15
Genus Cololejeunea (Spruce) Schiffn 16
Taxonomic Parameters 17
Key to the Indian Subgenera of Cololejeunea 20
Subgenus Chlorolejeunea Benedix 21
Cololejeunea madothecoides (Steph.) Benedix 21
Subgenus Aphanolejeunea (Evans) Benedix 22
Key to the Indian Species of the Subgenus Aphanolejeunea 23
Cololejeunea truncatifolia (Horik.) Mizut 24
C. hyalina sp. Nov 25
C. karnatakensis sp. Nov 26
C. nilgiriensis sp. Nov 27
Subgenus Pedinolejeunea Benedix ex Mizut 29
Key to the Indian Species of the Subgenus Pedinolejeunea 30
Cololejeunea furcilobulata (Berrie & Jones) Schust 31
C. ceratilobula (Chen) Schust 32
C. sigmoidea Jovet-Ast & Tixier 33
C. cardiocarpa (Mont.) Evans 34
C. producta (Mitt.) Hatt 35
C. latilobula (Herzog) Tixier 36
C. kashyapii Udar & Srivastava 39
C. udarii sp. Nov 40
C. planissima (Mitt.) Abeyw 42
C. foliicola Srivastava & Srivastava 45
C. lanciloba Steph 46
Subgenus Leptocolea (Spruce) Schiffn 48
Key to the Indian Species of the Subgenus Leptocolea 49
Cololejeunea minutissima (Smith) Schiffn 49
C. longifolia (Mitt.) Benedix ex Mizut 52
C. ceylanica Onraedt 53
C. trichomanis (Gottsche) Steph 54
C. gottschei (Steph.) Mizut 56
C. siangensis sp. Nov 57
Subgenus Cololejeunea Spruce 59
Key to the Indian Species of the Subgenus Cololejeunea 59
Cololejeunea haskarliana (Lehm. & Lindenb.) Schiffn 60
C. spinosa (Horik.) Pandé & Misra 61
C. mizutaniana Udar & Srivastava 62
C. pseudoplagiophylla Wu & Lou 63
C. jelinekii Steph 64
Subgenus Taeniolejeunea (Zwickel) Benedix 65
Key to the Indian Species of the Subgenus Taeniolejeunea 66
Cololejeunea appressa (Evans) Benedix 66
C. floccosa (Lehm. & Lindenb.) Schiffn 68
C. pseudofloccosa (Horik.) Benedix 70
Excluded Species 71
C. acinacifolia (Steph.) Kitag 71
C. marginata (Lehm. & Lindenb.) Schiffn 71
C. occellata (Horik.) Benedix 72
C. raduliloba Steph 72
C. desciscens Steph 72
C. tenella Benedix 72
Distribution and Ecology 73
Map 84
Plates 85
Explanation of Figures 138
References 148
Index of Scientific Names 152