()2 Vkit BiîHciiHi; Wn-inocK. 



Affinities and Differences. Tliis species forms tiie connecting link lietween 

 titliuphorw is(»<purc(C and P. hderosporcœ. Besides the conunon cask-sliaped spores, 

 spores occur here of a cylindrical or almost cylindrical form. Inclosed s])ores of 

 two kinds tlms existing in P. Ckveana nob., it might seem most reasonable to 

 |)]ace the species among Fithopliorce lieterosporcte. The cause why I have not done 

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

 phorœ iaoaponre, and 2:o that the cylindrical si)ores are so rare as to deserve being 

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

 nob. is its abundant helico'ids. They are t'onnd in all specimens that are somewhat 

 riclj in branches, and they are not rare e\en in those poorer in branches. With 

 P. knvcnsis nob., which is rather nearly related to P. Ckveana nolj., it has already 

 (page 55) been compared. From P. oidofion'ui (Mont.) nob. and Fithophorec lufcro- 

 sponœ it is distinguisiied liy characters so evident as not to nead special mciftion. 



Sectio II. PITHOPHOILE HETEROSPOREzE: 



»Spores of several, dissimilar forms in each species; the iuclnsed 

 of three forms, viz. cask-shaped, cylindrical and subirregnlar; 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 6 

 to 8). 



Specirs (). Pithopliora polymorpha noli. 



I'Jxsicc. HOHEiS'AC'K. Alg. mar. sice. lU:te l^iefer., n:o 472 a; sub nomine Chi- 

 chphora crispata Kiitz. 



Diagnosis: Principal hlament of the cauloïd part of the thallus in 

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

 two degrees; branches of the tirst 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 tirst degree partly cylindrical, partly cask-sha}>ed ; the 

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

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

 shaped on an av. 104 ft thick and 157 /.i long, the subirregnlar 121 /( 

 thick and 133 ,(t long; the terminal spores commonly subconical with 

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

 top somewhat rounded; the subconical spores on an av. 63 /( thick and 

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

 PI. 1, hgs" 13—17; pi. 4, hg. 19. 



