

No. 5] REVISED SYSTEM. SURVEY OF THE MELOBESIEAE. 17 



plug, afterwards the tap gets little 03?" little dissolved, frequently at 

 first in the middle and then upwards, leaving an annular border 

 belovv the roof, the plug disappears and a single pore arises in the 

 roof simultaneously with a decorticating of the whole superficial 

 prominence or a part of it, or the disc connected with the roof 

 by a central, attenuating plug and delicate filaments. 



Conceptacles of cystocarps immersed or subprominent, the 

 roof or a part of it forming convex prominences on the surface 

 of the frond; carpospores arising around the periphery of the „con- 

 jugation cell", the central parts of the latter with a bundle of 

 short paranemata. 



Subgen. I. Eulithophyllum Fosi. 



Conceptacles of sporangia immersed, at length forming de- 

 pressed point-like deepenings on the surface of the frond; the disc 

 frequently much overarched. 

 1. L. racemus (Lam.) Fosl. (incl. L. rhodica Unger?) 



f. typica. 



f. crassa (Phil.) Fosl. 



f. Kaiserii (Heydr.) Fosl. 



oblimans Heydr. (= L. racemus?) 



pliocaenum (Giimb.) Fosl. (= L. racemus?) 



Trabuccoi Fosl. mscr. (Lithoth. torulosum Trab. nee Giimb.) 1 ) 



affine Fosl. 



f. tuberosa Fosl. 



f. complanata Fosl. 



6. L. Andrusovi Fosl. 



7. L. hyperellum Fosl. 



*) In Soc. Tosc. Sc. Nat. Åtti Mem. Vol. XIII, p. 204, Mr. Trabucco mentions 

 a fossil calcareous Alga under the name of Litlwthamnion torulosum 

 Giimb. However, the picture 1. c. t. IX. fig. 3 shows that this form cannot 

 be referred to the said spedes, as the latter appears to be a true LitJw- 

 thamnion (cp. the note p. 8 of the present paper), while on the other hand 

 the form in question without doubt is a Lithophyttum nearly related 

 to L. racemus. No measures are given of the cells, but considering the 

 latter to be of the same size as in Lithoth. torulosum Giimb. it differs 

 in this respect so much from Lithopli. racemus that it must be considered 

 a separate species. Therefore I may be ailowed to propose the above name. 







L. 







0. 



L. 



4. 



L. 



5. 



L. 



