| 1. |
Thallus
unbranched, tubular near base and braodening distally; with 2
cell layers completely joined or with hollow margins |
.............. |
E.
linza |
| 1. |
Thallus
simple or branched, either tubular throughout, cylindrical throughout
ot in part, compressed throughout, or only distally flattened;
cell layers never completely joined |
|
2 |
| 2. |
Cells
in surface view not arranged in longitudinal rows in any part
of plant |
|
3 |
| 2. |
Cells
in surface view in longitudinal rows, at least in younger or narrow
parts |
|
4 |
| 3. |
Thallus
usually not branched, cylindrical throughout or flattened distally;
in section, outer cell wall thin |
|
E.
intestinalis |
| 3. |
Thallus
usually branched, with branches constricted at origin, the cylindrical
basal portion becoming compressed and usually broadening distally;
outer cell wall thick |
|
E.
compressa |
| 4. |
Thallus
profusely and repeatedly branched |
|
E.
clathrata |
| 4. |
Thallus
unbranched, or forming main axis with lateral branches |
|
5 |
| 5. |
Thallus
branched, rarely unbranched; cells in surface view not in transverse
rows |
|
E.
prolifera |
| 5. |
Thallus
unbranched, rarely branched; cells in surface view often in transverse
rows |
|
E.
flexuosa |
