| 1 |
Branches
originating in a single plane, becoming displaced with age; a
single basal attachment for each plant usually evident |
2
|
| 1 |
Branches originating at random, not in one plane; with age plants
becoming attahed at many places, the original holdfast becoming
obscure |
|
| 2 |
Basal
segments are cylindrical or cylindrical compressed, sometimes
barrel shaped |
|
| 2 |
Basal
segment is somewhat cuneate broad above and tapering at the base |
|
| 3. |
Base
of the plant showing one or more subterete to narrowed stalklike
segments; upper segments to 1.5 cm diam.; well calcified; surface
utricles when seen in section clearly in lateral contact for only |
|
| 3. |
Base
of the plant without stalk or at most one segment a little differentiated;
upper segments to 2-4 cm. diam., little calcified |
H.
discoidea
|
