50 



Veit Brecher Wittrock. 



Affinities and Differences. This species does not seem to be very nearly 

 related to any of the others in the same group. It is nicely distinguished from 

 both P. cequalis nob. and P. Jcewensis nob. by l:o its cylindrical or almost cylin- 

 drical and particularly long spores and 2:o by slighter ramification. From P. 

 cequalis nob. especially it differs by longer vegetative cells, and from P. hew ens is 

 nob. by much greater dimensions. 



2. Pithophora aequalis nob. 



Diagnosis: Principal filament of the caulo'id part of the thallus 

 in fertile specimens on an average 102 ^ thick, either with branches of 

 two degrees, those of the first few and long, those of the second short, 

 or with branches of only one degree, these numerous and short; spores 

 single, inclosed in the principal filament or in the branches of the first 

 degree, more rarely terminal ; the inclosed spores cask-shaped with 

 somewhat rounded ends, on an av. Ill ^ thick and 250 /x long; the 

 terminal spores cask-shaped with the upper end conical and the top 

 somewhat rounded, on an av. 98 [i thick and 288 /( long; the rhizoid 

 part of the thallus as a rule rudimentary. — Plate 1, figs. 4 — 7. 



[P. validior et longior, filo principali partis thalli cauloidese speciminum fer- 

 tilium circa 102 \i crasso, ramos, solitarios, aut numerosos breviores omnes primi 

 ordinis, aut paucos longos primi ordinis ramulis brevibus secundi ordinis inaeditos 

 emittente; sporis solitariis in filo principali vel in ramis primi ordinis inclusis, 

 rarius terminalibus; sporis inclusis paullum tumidis, oreuheformibus, apicibus sub- 

 rotundatis, c:a 111 (.i crassis et 250 (X longis; sporis terminalibus orcula;formibus 

 sursum brevi-acuminatis, apice rotundato, c:a 98 [i crassis et 288 (x longis; parte 

 thalli rhizoidea plerumque obsoleta.] 



Locality. This species is found by Mr Gollmer in small ponds on rocks 

 near La Guayra in Venezuela The specimens which I have examined have been 

 communicated to me by D:r A. Grunow under the name of Cladophora Roettlcri var. 



General Description. Fertile specimens. Caulo'fd part: As to the rami- 

 fication we may in this species distinguish two types: one distinguished by few but 

 long branches of the first degree, which generally carry short ones of the second 

 degree (pi. 1, fig. 4), and one by numerous but short branches of the first degree, 

 which remain unbranched. Connecting forms are found, though rare. The branches 

 are always single, one on each supporting cell. Rather often numbers of them are 

 unilateral. As usual in this genus they are attached somewhat below the top of 

 the supporting cell. This distance is in general shorter than the diameter of the 

 supporting cell. Branchless cells are more common in this species than in any 

 other. Besides the top cells and the supporting cells of the spores, the spores 



l ) The locality was thus given on the labels: »Aus den Gebirgsbassin La Guayra 

 unci zwar aus kleineren Wasseransamlungen auf Felsen.» 



