On THE PITHOPHORACEA. pian 55 
the cells is somewhat greater than in fertile specimens. The top cells in particular 
are often very long. I have seen top cells that have been more than 100 times as 
long as thick (compare pl. 2, fig. 8). 
Affinities and Differences. P. kewensis nob. shows a near relationship to 
P. Cleveana nob. and especially to P. oedogonia (Mont.) nob. LP. kewensis nob. 
differs from P. Cleveana nob. 1:0 in having all the inclosed spores cask-shaped (none 
eylindrical), 2:0 by the proportionally greater length of the inclosed, cask-shaped 
spores, 3:0 by narrower and a great deal longer vegetative cells, 4:0 by a much 
greater length of the whole specimen, 5:0 by the want of opposite branches in the 
purely fertile specimens, and 6:0 by the very rare occurrence of helicoids. The 
differences between P. kewensis nob. and L. ye doghnne (Mont.) nob. are indicated 
under the following species. Br 
4. Pithophora oedogonia (Mont.) nob. 
Synon. Conferva (Cladophora) ocdogonia Mont. Crypt. Guyan. p. 301. 
Cladophora Ocedogonia Mont.™Syll. p. 458; Kiitz. Tab. Phye. Band 6, p. 1 
tab. 1, fig. 1 (the figure not good). 
Diagnosis. Principal filament of the cauloid part of the thallus in 
fertile specimens on an average 70 « thick, with partly solitary, partly 
opposite branches of three degrees; siloperal branches rather common; 
spores usually single, but not rarely im pairs, partly inclosed, partly ter- 
minal; ~the inclosed spores cask-shaped, on an av. 114 « thick and 
230 w long; the terminal spores cask-shaped with the upper end conical 
and the ‘on somewhat rounded, on an av. 95 w thick and 214 « long. 
— Plate 6, figs. 1—6. 
[P. subgracilis et elongata, filo neti: partis thal cauloider speciminum 
fertilium circa 70 mw crasso, ramos trium ordinum singulos vel binos oppositos ferente; 
ramis subsporalibus non raris; sporis plerumque singulis (non raro ree vel inclusis 
vel terminalibus; sporis inclusis orculeeformibus, e:a 114 w crassis et 230 « longis ; 
sporis terminalibus orculzeformibus, sursum inerrant apice subrotundato, e:a 
95 w crassis et 214 «w longis.]. 
Locality. This species is found by Mr L&EPRIEUR in South America at 
Cayenne in French Guyana. Professor MONTAGNE gives in Crypt. Guyan. 1. ¢. its 
locality thus: »in puteis hospitii nautici apud Cayenne lecta». Epiphytically on it 
grows a sterile Ocdogonium. 
General Description. Fertile specimens. Cauloid part of the thallus. 
The ramification of the cauloid is very powerful in this species. Branches are here 
regularly found of three degrees, and in the specimen which I have represented 
pl. 6, fig. 5 even a cell belonging to a branch of the 3:rd degree has emitted a 
small branch-process, marked 4?, which is consequently a rudimentary branch of 
the 4:th degree. The branches of the I:st degree are sometimes single and some- 
times opposite in pairs (pl. 6, figs. 2, 3, 4). The case is the same not only with 
? 
