On the Pithophoeace^. 49 



l:st degree, solitary or opposite; spores inclosed (rarely terminal), single, 

 cylindrical or subcylindrical, on an av. 106 jn thick and 375 /( long. — 

 Plate 1, figs. 1—3; pi. 4, fig. 1. 



[P. subvalida, filo prineipali partis tlialli cauloideaî specimiüum fertilium circa 

 127 fi crasso, ramos imius solum ordinis, solitarios rel biuos oppositos emitteute ; 

 sporis inclusis (raro terminalibns), solitariis, cjiiudricis vel subcylindricis, c:a 106 n 

 crassis et 375 ^i longis.] 



Locality. This species is found by Professor D:r E. x. Martens j:r in the 

 moats outside the fortress at Palembaug in Sumatra, the 29*'' of March 1862. — 

 Epiphytically ou the same grows a (sterile) Oedof/on him vfhich has been described, 

 1. c. pag. 20, by G. y. Martens s:r under the name of Conferva (Ocdogonium?) 

 Cladophorce. 



General Description. Fertile specimens. Cauloïd part of the thallus. 

 The rather few fertile specimens I have seen of this species have had branches 

 only of the l:st degree. These have mostly occurred singly; but sometimes also 

 two and two opposite to each other. The branches are always placed a little space 

 below the top of, the supporting cell. This space, however, is in general so short 

 as to be smaller than the diameter of the branch. Neither accessorial branches nor 

 helicoïds have been observed. The spores are, as a rule, inclosed. Only one ter- 

 minal spore I have observed, to wit, the sessile one represented in plate 1, fig. 1 st. 

 The inclosed spores are found in the principal filament as well as in the branches. 

 Their form is generally cylindric. Sometimes they are not at all swollen and then 

 they are almost perfectly cylindric (pi. 1, fig. 2); sometimes they are a little swollen 

 and are then cylindrically cask-shaped (pi. 1, fig. 3). Twin spores I have not 

 observed. 



Rh iz Old-part of the thallus. I have seen only one specimen, the rhizoïd 

 part of which has not been broken off. This one quite accords as to the nature of 

 the basal cell with the specimen of P. œquah's nob. represented in pi. 1, fig. 6. 

 Thus a rhizoïd part had never been developed in this specimen. 



Sterile specimens resemble the fertile ones as to the ramification. In one 

 of the examined specimens the basal part was preserved. This showed a rhizoïd 

 part consisting of one cell (pi. 4, fig. 1 rli), parted from the cauloïd by an oblique 

 cell-wall. 



IVIeasurements. Fertile specimens. The vegetative cells of the principal 

 filament are on an av. 127 fi thick; the smallest observed thickness is 105 /ii and 

 the greatest 150 /(. The vegetative cells of the branches are on an av. 92 /^i thick. 

 They vary between 75 and 125 /.(. The length of the cells is 5 — 25 times the 

 thickness. Most frequently.it is rather considerable, being 12 — 14 times the thick- 

 ness. The inclosed spores are on an av. 106 fi thick and 375 /.i long. The limits 



dation are indicated by f'^t^lo^ 

 served was 75 f.i thick and 555 jn long. 



Sterile specimens. The thickness of the principal filament is on an av. 

 137 /(; the smallest observed thickness is 115 ji, and the greatest 180 /.i. The 

 branches are oa an av. 95 f« thick; the smallest observed thickness is 75 and the 

 greatest 110 /.i. The length of the cells is about the same as in the fertile specimens. 



Nora Acta Reg. Soc. Sc. Ups. Ser. III. 7 



