2- 



e) Pungi: Uredinales, Ustilaginales and Gasteromycetes, 1801 



(Persoon, Synopsis Methodica Fungornm). 



f ) All other fungi. 1821-32 (Pries, Systeoia mycologictira) . 



g) Algae, 1753 (linneus Species, plantarum ed. l). 



Exceptions: Wostocaceae homocysteae, 1892-93 (Gomont, 

 Nostocaceae homocysteae); Wostocaceae heterocysteae, 1886 

 Bornet et Plahault, Nostocaceae heterocysteae); Desmidiaceae, 

 1848 (Ralfs, British Desmidiaceae) ; Oedogoniaceae, 1900 Hirn, 

 Monographie tind Iconographie der Oedogoniaceen). 



li) Myxomycetes, 1753. 



It is agreed to attach the genera whose names appear in 

 the edition 1 of the Species plantarum of Linneus to the des- 

 criptions which are given in Genera plantarum, ed. 5 (year 1754). 



The starting points for the nomenclature of the following 

 groups are reserved for action by the Congress of London in 1915: 

 Schizomycetes (Bacteria); Schizophyceae (excl. Nostocaceae), 

 Plagellatae (incl. Dino-f lagellatae ) ; Bacillariaceae 

 ( Diatomacae) . 



Art. 20. However, in order to avoid disadvantageous changes in 



the nomenclature of genera through the strict application of the 



Rules of Nomenclature, and in particular of the principle of 



priority commencing with this dates given in Article 19, the 



rules provide a list of names which must be retained in all 



cases. These names are by preference those which have come into 



general use in the fifty years following their publication or 



which have been used in monographs and important florist works 



up to the year 1890. Por the use of paleobotanists a double list 



is prepared. 

 I 



1st. A list of generic names of living plants validly published 

 and generally admitted, at the time when they came into collision 

 with the older paleobotanical generic names; 



2nd. A list of generic names of fossil plants, validly published 

 i and generally admitted, at the time when they came into collision 

 with the older homonyms of living plants fallen under synonymy 

 iin order to avoid these latter ones being utilized again. These 

 lists appear in an appendix to the rules of nomenclature. 



Section 3, Nomenclature of the different kinds^of groups, 

 Paragraph 4, Names of species and of subdivisions ^f.^.^secles.'^ 



Recommendations. ^^^ r.p ^1.,-S ■• • ^ ■ ^Oi OiH 



XY. bis. The special forms fPorma Specialist ar^e named prefer-' 

 ably at least with the name of the host species. ^'' In ^dping this 

 double names may be employed. "^^ ^.:;=i.sp-==^"' 



