Under the name Phoma Pries emend. Desm. are included 

 a group of Fungi Imperf ecti '( Deuteromycetes ) various representa- 

 y^lt °^ which have the pycnidial stage like that of the species 

 of the genus Diaporthe ( Valsaceae , Ascomycetes ) : Phoma ailanthi 

 Sacc, belongs to Diapoythe ailanthi Sacc. , Phpras alnga (Kitschke 

 Sacc,, belong to Diaporthe alnea Puck. , Phoma detrusa ? Pries ) 

 Puck* belong to Diaporthe detrusa Sacc. etc. However, since the 

 perfect stage of many species of the "genus" Phoma is not known, 



J and in many cases probably does not exist at all, we have the 

 ractical necessity of maintaining the name "Phoma" to designate 

 he group of Fungi Imperfecti in question. 



Section 7. Names to be rejected, changed, or modified. 



;&rt. 54. The names of genera must be rejected in the following 

 special cases: 



1st,- When they are the same as technical terras commonly 



used in morphology, unless they are accompanied 



by specific names. 

 2nd. When they express uninomial nomenclature. 

 3rd. When they are formed of two words unless these 



two words were from the first united by a 



hyphen. 



Art, 56. In the cases foreseen in Articles 51 to 56, the name 

 to be rejected or changed is replaced by the oldest ralit name 

 in the group in (Question, and in default of such a one, a new 

 name must be made. A valid name and in particular a combination 

 of names is assumed to be formed in conformity with the rules of 

 pomenclature. The author of a new combination may, if he choses, 

 use the specific name of a non-valid (nom mort-ne) binomial, or 

 he may employ a new name. 



Examples:- Linum radiola, L (175S) placed in the genus Radiola 

 should be called Radiola linoide^- Roth (1788); nothing necessi- 

 tates that the more ancient eynonyro Linum multiflorom lamk. 

 (1778) be used,, this combination being eontrary to Art, 51, 1st. 

 of the Rules. _Peu_c.eAaauffis_il.aUB., L. (1753) in the genus Silaus 

 must be called Silaus flavecens Beifih. fl800); nothing necessi- 

 tates that the more ancient synonym Seseli gelinoides Jacq. 

 |(1762) be used, this combination being contrary to Article 48 of 

 the Bules. Polypodium montanum Vogl. (1781), not l^nrfCar_.( 1778 ) = 

 |P. oreopteris Ehrh. ex. Willd. (1787), placed^ in th6' g^nue ^Dryr 

 gpteris . should be called D. oreopteris Max*/; \no thing necesegr i • 

 ftates that the more ancient synonym Polypodluaa montanum Vogl.'; be 

 used, this cOTibination being contrary to tiwrEules,* 4rt. 51, 2nd. 

 It is true that P, montanum lamk, has later cieen^placed in the' 

 genus CystopterisTC. montana (Izmk, ) Desv.^.^but the genustfis ^^ 

 Systopteris was dated 1806: Ehrhart could neither forteee norN*^^ 



