50 Veit Brecher Wittrock. 



Affinities and Differences. This species does uot seem to be very nearly 

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

 both P. (cqiinliti nob. and l\ kctccnsis nob. by l:o its cylindrical or almost cylin- 

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

 (equal is nob. especially it differs by longer vegetative cells, and from P. ]:eir( i?.sis 

 nob. by much greater dimensions. 



2. Pithophora sequalis nob. 



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

 in fertile specimens on an average 102 /.i thick, either with branches of 

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

 or with branches of ordy one degree, these nnmerous 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 ^i thick and 250 ^ long; the 

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

 somewhat rounded, on an av. 98 /j, thick and 288 jn long; the rhizoïd 

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



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

 tilium circa 102 /.i crasso, ramos, solitarios, aut uumerosos breviores onines primi 

 ordinis, aut paucos longos primi ordinis raraulis brevibus secundi ordinis pvfcditos 

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

 rarius terminalibus; sporis inclusis paullum tumidis, orcula3forraibus, apicibus sub- 

 rotundatis, c:a 111 fi crassis et 250 fi longis; sporis terminalibus orcuhiiformibus 

 suvsum brevi-acumiuatis, apice rotundato, c:a 98 ft crassis et 288 ^ longis; parte 

 thalli rhizoidea plerumque obsoleta.] 



Locality. This species is found bj' Mr Gollmee 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 Claduiihova Boitthri var. 



General Description. Fertile specimens. Caulo'id 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 generali}' carry short ones of the second 

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

 which remain unbranchcd. 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 ot 

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

 supporting cell. Branchless cells are ihore common in this species than in anj' 

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



') The locality was thus given on the labels: »Aus den Gebirtcsbassin La Guavia 

 und zwar nus kleineren Wasseransauilunsren auf Felsen.» 



