80 



Veit Brecher Wittrock, On the Pithophorace^e. 



Figs. 9 and 10. P. kewensis nob. 

 Fig. 9. A branch carrying a helicoYd, h, from a sterile specimen. 

 s> 10. The top cell of the principal filament of a sterile specimen transformed 

 to a helico'id, h. 



Figs. 11 and 12. P. Roettleri (Roth) nob. 

 Fig. 11. A branch from a fertile specimen, carrying a helico'id, //, which grasps &• 

 vegetative cell belonging to another specimen of a Pithophora. 

 » 12. The top of a branch of a fertile specimen with a lateral helico'id, h. 



PLATE VI. 



The figures are magnified 20 times, with the exception of fig. 6 

 which is magnified 50 times. 



Pithophora oedogonia (Mont.) nob. 

 Fig. 1. The lowest part of a sterile specimen with a unicellular rhizo'id, rh, and 

 caulo'id branches placed opposite to each other. 



» 2. The lowest part of a fertile specimen with a pluricellular rhizo'id, rh. A 

 parting-wall between the caulo'id and rhizo'id part has not been formed in the 

 germination of the mother spore, sg. 



» 3. The lower part of a fertile specimen with a very powerfully developed, 

 sporiferous rhizo'id, rh, carrying branches of as much as two degrees. The 

 upper one of the twin spores, s, in the caulo'id has germinated in the same 

 manner as the spores in fig. 6; compare the explanation of this figure. 



» 4. The lower part of the caulo'id of a fertile specimen with a peculiarly rich 

 system of ramification, even embracing a branch of the 4:th degree, b*. 

 Numerous subsporal branches, bs 2 , bs 3 , as well as also basal accessorial 

 branches (= rhizine branches), ac, occur. The spore, s, in the principal fila- 

 ment has germinated in the same manner as the spores in fig. 6. Twin 

 spores, s', s", occur in several places. 



» 5. Part of the caulo'id in a fertile specimen. Subsporal branches, bs, occur, 

 even placed opposite to each other. The subsporal cells are unusually short. 



» 6. Uppermost part of the caulo'id of a fertile specimen. The spores, the in- 

 closed, s, as well as the terminal one, st, have germinated while still attached 

 to the mother specimen; and not in the normal manner with spores, but in 

 the manner of prolific cells. 



