62 



Veit Breciier Wittrock. 



Affinities and Differences. This species forms the connecting link between 

 Fithophoree isosporeee and P. heterosporcce. Besides the common cask-shaped spores, 

 spores occur here of a cylindrical or almost cylindrical form. Inclosed spores of 

 two kinds thus existing 1 in P. Chveana nob., it might seem most reasonable to 

 place the species among Fithophoree heterosporcce. The cause why I have not done 

 so is l:o that P. Chveana nob. evidently has its nearest relatives in the real Fitho- 

 phoree isosporeee, and 2:o that the cylindrical spores are so rare as to deserve being 

 regarded merely as exceptions. — The most remarkable character in P. Cleveana 

 nob. is its abundant helicoids. They are found in nil specimens that are somewhat 

 rich in branches, and they are not rare even in those poorer in branches. With 

 P. hewensis nob., which is rather nearly related to P. Cleveana nob., it has already 

 (page 55) been compared. From F. ocdogonia (Mont.) nob. and Fithophoree hdero- 

 sporcce it is distinguished by characters so evident as not to nead special mention. 



Sectio II. PITHOPHOR,E PIETEROSPORE^E: 



Spores of several, dissimilar forms in each species; the inclosed 

 of three forms, viz. cask-shaped, cylindrical and snbirregnlar ; the ter- 

 minal as a rule of two forms, viz. cask-shaped and cylindrical, both with 

 the upper end conical and the top somewhat rounded. (Species G 

 to 8). 



Species 0. Pithopliora polymorpha nob. 



Exsicc. Hohenack. Alg. mar. sice. 10:te Liefer., n:o 472 a; sub nomine Cla- 

 dophora crispata Kiitz. 



Diagnosis : Principal filament of the cauloid part of the thallus in 

 fertile specimens on an average 105 /i thick, with branches of one or 

 two degrees; branches of the first degree solitary or more rarely oppo- 

 site in pairs; branches of the second degree solitary; spores solitary 

 (rarely in pairs), partly inclosed, partly terminal; the inclosed spores in 

 branches of the first degree partly cylindrical, partly cask-shaped; the 

 inclosed spores in the principal filament usually of an irregular shape; 

 the cylindrical spores on an av. 63 fi thick and 88 fi long, the cask- 

 shaped on an av. 104 p thick and 157 ^ long, the subirregular 121 *p 

 thick and 133 p long; the terminal spores commonly subcorneal with 

 the top rounded, rarely cask-shaped with the upper end conical and the 

 top somewhat rounded; the subcorneal spores on an av. 63 n thick and 

 155 p long, the cask-shaped on an av. 95 p thick and 148 p long. — 

 PI. 1, figs. 13—17; pi. 4, fig. 19. 



