RHODOPHYTA OF TROPICAL AFRICA 71 



(ii) Subsidiary italicized headings, in square brackets. These represent the different ways in 

 which the species has been cited by authors publishing records of relevance. The manner of 

 citation by species names, even when manifestly incorrect, has been maintained unless the 

 original author's intent required clarification for comprehension; there will thus be no doubt 

 as to which record we attribute to which accepted species. 



(iii) The distributional data, within which the countries are arranged in alphabetical order and 

 more generalized statements of distribution appear after the specific countries. The latter 

 statements are included verbatim as it is not always clear for precisely which countries they 

 establish records. The numbers given in parentheses after each country name or generalized 

 statement of distribution refer to the corresponding numbers in the references. Works cited 

 in the present list of Bangiophyceae have been newly numbered so that a given number here 

 does not, except by accident, correspond to that given to the same reference in previous parts. 

 It should be stressed, therefore, that lists of references are not interchangeable and must be 

 used only with the part to which they are appended. 



New records, based on recent field observations, appear with the term 'unpublished', 

 following them. An exception has been made in the case of reference number 49; Mr R. H. 

 Simons kindly provided us with records from the South West Africa [Namibia] Expedition 

 of 1957. 



(iv) Additional notes, where needed, are inset immediately below the entry concerned. Citation 

 of a reference in the explanatory notes depends on whether it contains records (when it consists 

 of authors' name(s), followed by the number in the terminal reference list and where necessary, 

 after a colon, the relevant pages) or not (when it consists of authors' name(s), date of publi- 

 cation and where necessary, after a colon, page numbers). 



Species nomenclature has been revised as far as possible and the complete author citation is 

 given for each accepted combination. Discarded combinations under which records for the 

 area have previously been published are no longer (unlike the arrangement for parts I and II) 

 included as entries in the list. They, together with all other names mentioned in the species entries, 

 are now included as a separate terminal list of cross-references. This has been a result dictated 

 by the present systematic arrangement. At different times in the past, generic placement within 

 families and orders has varied, so that inclusion of required cross-references within only the 

 currently most appropriate family and/or order would not guarantee that users would readily 

 locate them. Repetitions of cross-references in several different families or orders would have 

 been excessively space-consuming. The problems that will arise where it is necessary to cross- 

 reference from one family or order of the Rhodophyta to another when these are in separate 

 published parts do not arise in connection with the present list and will be dealt with in the intro- 

 duction to the first part so affected. 



As with the previous parts, this list of Bangiophyceae is still preliminary in the sense that 

 considerable reassessments of both taxonomy and nomenclature are required in this group. 

 Within those reservations, the present list includes all traced data published up to the end of 

 September 1978, together with additional herbarium and MSS information. Further additions 

 from users who detect omissions or errors in the list will be welcome. 



We are grateful to Mr J. F. M. Cannon, Keeper of Botany, British Museum (Natural History), 

 for the provision of research facilities. 



Species list 



PORPHYRIDIALES 



Porphyridiaceae 

 Rhodosorus marinus Geitler 

 Canaries (21; 27; 36). 



Note. Originally described by Geitler (21) from a seawater culture from Las Palmas. Heerebout 

 (24) has pointed out the close resemblance to this plant of the kind of 'palmella' stage produced 

 in culture by the division of monospores formed in the older parts of the disc of Erythrodadia. 



