On the Pithophorace^e. 



75 



2. A piece of a branch of the l:st degree with two inclosed cylindrical spores; 

 in the uppermost cell a third spore is in the act of being formed. 



3. A piece of the principal filament with an inclosed, cylindrically cask-shaped 

 spore. 



Figs 4 to 7. P. sequalis nob. 



4. A piece of the cauloi'd, viz. a short bit of the principal filament with a very 

 short accessorial branch, ac, and a long normal fertile branch of the list de- 

 gree, carrying a branch of the 2:d degree, b 2 . 



5. A complete and fertile specimen, quite devoid of branches, with a rudi- 

 mentary rhizoi'd, rh. 



6. The lower part of a sterile specimen. At sg? the mother spore of the 

 specimen has probably been situated; and if this be the case the specimen 

 would be quite devoid of a rhizoi'd. 



7. The uppermost part of a big sterile specimen with the branches almost 

 unilateral. 



P. kewensis nob. 



8. A complete, though rather small, sterile specimen with a rudimentary rhizoi'd, 

 rh. The top cell of the principal filament is unusually short and, against the 

 rule, supports a branch. 



Figs. 9 to 12. P. Zelleri (v. Mart.) nob. 



9. A piece of a fertile cauloi'd. The subsporal cells have, instead of (as usual 

 in this species) forming another spore below the one first formed, sent forth 

 each a subsporal branch, bs. Another branch of the first degree incloses a 

 pair of twin spores, s, s". 



10. A piece of the principal filament of a fertile cauloi'd. The lower spore, 

 s", in the upper pair of twin spores has, against the rule, formed a perfectly 

 individual cell-wall. The upper spore in the lower pair of twin spores has germi- 

 nated, like a prolific cell, while still attached to the mother specimen. Compare 

 pi. 6, fig. 6. 



11. The uppermost part of the principal filament of a fertile cauloi'd. All its 

 cells have formed twin spores s' } a". 



12. The lower part of a sterile specimen. The cell marked rh probably be- 

 longs to the rhizoi'd, and the one marked ac is probably an accessorial basal 

 (rhizine) branch. 



Figs. 13 to 17. P. polymorpha nob. 



13. The middle part of the cauloi'd of a richly ramified fertile specimen. 



14. The top of a branch of the list degree. 



15. A piece of a cauloi'd. The principal filament carries two abnormal 

 branches, in which the cells marked p, p are probably prolific cells. 



16. A piece of a cauloi'd with twin spores, $', s", in branches of the list degree 

 as well as in the principal filament. 



17. The uppermost part of the cauloi'd in a somewhat deviating, fertile spe- 

 cimen. Observe an inclination to ramify in the top cell of the principal fila- 

 ment as well as in a terminal cell of a branch. 



