On the Pithophoraceve. 



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 pi. 2, tig. 8). 



Affinities and Differences. P. hewensis nob. shows a near relationship to 

 P. Clcveana nob. and especially to P. oedogonia, (Mont.) nob. V. Icewensis nob. 

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

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

 spores, 3: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 helico'ids. The 

 differences between P. hewensis nob. and P. ocdogonia (Mont.) nob. are indicated 

 under the following species. 



4. Pithophora oedogonia (Mont.) nob. 



Synon. Conferva (Cladophora) ocdogonia Mont. Crypt, Guyan. p. 301. 

 Cladophora Oedogonia Mont, Syll. p. 458; Kiitz. Tab. Phyc. Band 6, p. 1, 

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



Diagnosis. Principal filament of the cauloid part of the fchallus in 

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

 opposite branches of three degrees; subsporal branches rather common; 

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

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

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

 and the top somewhat rounded, on an av. 95 ,u thick and 214 ju long. 

 — Plate 6, figs. 1 — 6. 



[P. subgracilis et elongata, filo principali partis th alii caulol'dese specinhnum 

 fertilium circa 70 /tt erasso, ramos trium ordinum singnlos vel binos oppositos ferente; 

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

 vel terrain alihus ; sporis inclusis orculad'ormibus, c:a 114 (x crassis et 230 /i longis ; 

 sporis terminalibus orcuheformibus, sursum brevi-acuminatis, apice subrotundato, c:a 

 95 /«. crassis et 214 /.i longis.]. 



Locality. This species is found by Mr Lepkieur 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 Oedogonhon. 



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 

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

 small branch-process, marked 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. G, figs. 2, 3, 4). The case is the same not only with 



