22 



is taken by me. Cp. pi. 3. I on the other hand regard the plant 

 delineated 1. c. pi. 4, fig. 2 as typical or nearly typical f. inter- 

 media. This form is characterized by its central or lower portion 

 forming coarse and clumsy lobes, which are coarser than such 

 ones in f. typica, or sometimes being nearly solid. From the 

 named lobes issue simple and rather coarse, most often conically 

 cylindrical branches with obtuse ends, now and then carrying wart- 

 like processes. This form frequently encompasses smaller stones, 

 and it apparently seldom attains any considerable size. 



The form nana is in the cited paper recorded as little inde- 

 pendent. . It is rather characteristic in its typical development, but 

 intermediate forms between this one and partly f. typica partly f. 

 intermedia and occasionally even f. curvirostra axe, more generally 

 to be found than quite typical specimens. It frequently is onty 

 0.5 — 1.5 cm. in diameter. 



The form glomerata is characterized by its generally solid 

 central portion or occasionally coarse lobes, from which issue in 

 ail directions subglobose bundles of branches. These bundles are 

 composed of very short branches, in their upper part carrying 

 wart-like processes, and nearly always rather anastomosing, often 

 even towards the apex. PI. 4, fig. 3. The ends are rounded or 

 obtuse. If not much attacked by animals the central part is con- 

 tinuing thick and solid, or intersected with cavities and canals, 

 encompassing smaller stones, or not, but if attacked especially in 

 a younger stage it forms coarse and clumsy lobes, and the plant 

 sometimes at length becomes quite hollow. It attains a diameter 

 of about 10 cm. 



A rather independent plant is f. corymbiformis, and it, perhaps, 

 ought to be regarded as a separate species. However, I have seen 

 but few specimens of this form. On the one side it appears to 

 pass into the typical form and on the other is nearly connected 

 with f. glomerata, or even showing close affinity to f. flexuosa. 

 It never forms a solid central portion, but coarser lobes, all hough 

 not so coarse as in the preceding form. From the named lobes 

 issue subcorymbose clusters of branches, which are far less ana- 

 stomosing than in f. glomerata, but on the other hand coarser, 



