The effect of intensity of desiccation

In addition to the factors considered in Fig. 7.1, recovery and long-term survival depend on the equilibrium water potential to which the bryophyte has been desiccated. Dilks and Proctor (1974) gave recovery data for several species following desiccation at different water potentials, which showed that some, like Plagiothecium undulatum, are more severely damaged the lower the water potential to which they have equilibrated, while others, such as Racomitrium lanuginosum, show better long-term...

Cyperaceae

Raynal Carexphysodes M. Bieb J.G. Duckett and M.C. Proctor (unpublished data) Pessin (1924), Stuart (1968), Gaff (1977), Iturriaga et al. (2000) Hambler (1961), Owoseye and Sanford (1972) Microdracoides squamosa Hua (monotypic) Brachyachne patentiflora (Stent and Rattray) C.E. Hubb. Eragrostiella brachyphylla (Stapf) Bor., E. nardioides (Trin.) Bor. Eragrostis hispida K. Schum., E. nindensis Fic. and Hiern, E. paradoxa Launert Micraira spinifera Lazar, M. tenuis...

Constitutive and induced tolerance

Desiccation tolerance apears to be largely constitutive in the highly desiccation-tolerant bryophytes on which most work has been done, such as T. ruralis (Oliver and Bewley, 1997 Oliver et al., 1998), R. lanuginosum and A. viticulosus. However, in many species of more mesic habitats, tolerance is induced to varying degrees. The physiology of the induction of enhanced tolerance in such important groups as the Bryaceae, Mniaceae and the common pleurocarpous families in the Hypnobryales is almost...

Vegetative propagules bulbils corms tubers and plant fragments

Many normal homoiohydric vascular plants produce vegetative propagules, which often serve to carry the plant through unfavourable dry periods. These include bulbils formed either in the soil as in many Oxalis species Robb, 1963 or in leaf axils above ground, often replacing flowers as in Ranunculus ficaria, Cardamine spp., Saxifraga spp. and Allium spp. Richens, 1947 . There are also various kinds of stem and root tubers, and viable shoot fragments, which establish as independent plants....

Pteropsida Ferns Adiantaceae sensu lato

Cheilanthes bonariensis Wild Proctor, C. integerrima Hook. Mickel., C. myriophylla Desv. Cheilanthes buchtienii Rosenst. Capurro, C. glauca Cav. Mett., C. marginata H.B.K. Cheilanthes capensis Thunb. Desv., C. depauperata Bak., C. dinteri Brause, C. eckloniana Kunze Mett., C. hirta Sw., C. inaequalis Kunze Mett., C. marlothii Hieron Mett., C. multifida Sw. Sw., C. parviloba Sw. Southwestern USA, Hooker 1837 , Gaff 1971 , Eickmeier Mexico West Africa Southwestern US Mexico South Africa South...

Scrophulariaceae

Chamaegigas intrepidus Dinter ex Heil Craterostigma monroi S. Moore, C. nanum Engl. Ilysanthespurpurascens Hutch., I. wilmsii Engl. and Diels South Africa South Africa South Africa Bewley and Krochko 1982 , M ller et al. 1997 Gaff and McGregor 1979 , Schwab et al. 1989 Bewley and Krochko 1982 , M ller et al. 1997 Markovska et al. 1994 Porembski and Barthlott 2000 Thoday 1921 , Child 1960 , Gaff 1971, 1977 Gaff 1971, 1977 , Schwab et al. 1989 Gaff 1971, 1977 Gaff 1977 Porembski and Barthlott...