On the Pithophorace^. 55 



the cells is somewhat greater than iü 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 pi. 2, fig. 8). 



Affinities and Differences. P. kewensis nob. shows a near relationsliip to 

 P. Clcveana nob. and especially to P. oedogonia (Mont.) nob. F. hnvensis nob. 

 differs from P. Cleveana nob. l:o in having all the inclosed spores cask-shaped (none 

 cylindrical), 2:o by the proportionally greater length of the inclosed, cask-shaped 

 spores, o:o by narrower and a great deal longer vegetative cells, 4:o by a much 

 greater length of the whole specimen, 5:o by the want of opposite branches in the 

 purely fertile specimens, and 6:o by the very rare occurrence of helicoïds. The 

 differences between P. heioensis nob. and P. oedogonia (Mont.) nob. are indicated 

 under the following species. 



4. Pithophora oedogonia (Mout.) nob. 



Synon. Conferva (Cladophora) oedogonia Mont. Crypt. Guyan. p. 301. 

 Cladopliora Oedogonia Mout. Syll. p. 458; Kiitz. Tab. Phyc. Band ß, p. 1 

 tab. 1, fig. 1 (the figure not good). 



Diagnose. Principal filament of the eauloïd part of the thalhis in 

 fertile specimens on an average 70 ^i thick, with partly solitary, partly 

 opposite branches of three degrees; subsporal branches ratlier common; 

 spores usually single, but not rarely in pairs, partly inclosed, partly ter- 

 minal; the inclosed spores cask-shaped, on an av. 114 ^ thick and 

 230 ,« long; the terminal spores cask-shaped with the upper end conical 

 and the top somewhat rounded, on an av. 95 (.i thick and 214 ,/(. long. 

 — Plate 6, figs. 1—6. 



[P. subgracilis et elongata, filo principali partis thalli cauloïdeœ speciminum 

 fertilium circa 70 i.i crasso, ramos trium ordinum singulos vel binos oppositos fcrente; 

 ramis subsporalibus non raris; sporis plerunique singulis (non raro binis), vel inclusis 

 vel terminalibus; sporis inclusis orculœforniibus, c:a 114 ß crassis ct 230 /t longis ; 

 sporis terminalibus orculaifonnibns, sursum brevi-acuniinatis, apice subrotnndato, c:a 

 95 f-i crassis et 214 ^ longis.]. 



Locality. This species is found by Mr Leprieur in South America at 

 Cayenne in French Guyana. Professor Montagne gives in Crypt. Guyan. 1. c. its 

 locality thus: »in putcis hospitii nautici apud Cayenne lecta». Epiphytically on it 

 grows a sterile Oedogoniviii. 



General Description. Fertile specimens. Cauloïd part of the th alius. 

 The ramification of the cauloïd is very powerful in this species. Branches are here 

 regularly found of three degrees, and in the specimen which I have represented 

 pi. 6, fig. 5 even a cell belonging to a branch of the 3:rd degree has emitted a 

 small branch-process, marked If, which is consequently a rudimentary branch of 

 the 4:th degree. The branches of the l:st degree are sometimes single and some- 

 times opposite in pairs (pi. 6, figs. 2, 3, 4). The case is the same not onlv with 



