M. FOSLIE. [1900 



based upon a hitherto unknown form of sporangia 1 ) and the latter 

 in the main corresponding to Lithophyllum (Eulithophyllum) as 

 limited by me in Syst. Surv. and in another sense than formerly. 

 The then genus Lithophyllum was, however, not hinted at in the 

 system of Rothpletz. This work be it said, was not known to 

 me till shortly before the publication of the said Syst. Surv. 



In 1897 Mr. Heydrich 2 ) set up a system chiefly based upon 

 the development of the vegetative organs. — „Die bisherige Ein- 

 theilung wåre eine vollig gentigende, wenn man danach die ein- 

 zelnen Genera erkennen konnte; da dies nicht der Fall, mochte ich 

 mir den Vorschlag erlauben, einfach mathematisch vorzugehen. 

 Dies geschieht durch das auseinanderhalten der Zellschichten und 

 Zellagen, sowie die Eingangs erwahnten Rhizoiden mit ihrer An- 

 heftung". This system in as far considerably differs from the ear- 

 lier ones founded upon the development of thallus, as both L. 

 Lenormandi Are sch. and L. cristatum Men eg h. are subsumed 

 under Lithoihamnion, while on the other hand L. lichenoides (Ell. 

 et Sol), L. capense (Harv.) and L. Philippii Po sl. (L. decus- 

 satum So Ims nee Phil.) are considered to be Lithophyllum, Me- 

 lobesia Corallinae also being subsumed under this genus. 



In some notes 3 ) on this system I again asserted that the syste- 

 matical classification of the hereto pertaining genera could not be 

 based upon the development of the vegetative organs, and remarked 

 1. c. „Die Begrenzung der ?genannten genera (Lithothamnion, 

 Lithophyllum) scheint daher meiner Ansicht nach keinen Schritt 

 weitergefiihrt zu sein. — ■ — nnhaltspunkte werden freilich in ån- 

 deren Richtungen zu suchen sein". 



After three months Mr. Heydrich 4 ) set up a new system and 



a ) It seems that no accurate line can be drawn between these sporangia and 

 the same of Lithothamnion, as they sometimes approach each other con- 

 siderably, the partition perhaps excepted. Cp. Fosl. New or crit. calc. 

 Alg. Trondhjem 1899. Pag. 5. Also in other species I have seen forma-; 

 tions approaching the former. 



2 ) F. Heydrich, Corallinaceae, insbesondere Melobesieae. Ber. der Deutsch. 

 Bot. Ges. 1897. Pag. 34. 



3 ) M. F o slie, Einige Bemerkungen uber Melobesieae. Ber. der Deutsch. Bot. 

 Ges. 1897. Pag. 252. 



4 ) F. Heydrich, Melobesiae. Ber. der Deutsch. Bot. Ges. 1897. Pag. 403. 



