* Descriptive names are inventions
to aid identification,
and are not commonly used
“Algae Revealed” R N Baldock, S Australian State Herbarium, March 2009, additions October 2009
50.470
Techniques needed
Classification
Phylum: Chlorophyta; Order: Ulvales; Family: Ulvaceae
*Descriptive name
silky sea lettuce
Features
plants, green, broad paddle-shaped, 20-100mm tall with a silky surface, on a
short stalk rapidly widening to a blade smooth or ruffled on edges
Special requirements
view the surface of branches microscopically to find
1.
cells angular, square or rectangular, relatively large (16-22μm long), in
lines or in
arcs around growing centres
2.
chloroplasts containing a
single bright body (pyrenoid) (2 if the cell is
dividing)
3.
cross sections show 2 cell layers separated by a narrow cavity
only at the
blade edge
Occurrences
S Australia and Port Phillip, Victoria; doubtfully from Tasmania and NSW
Usual Habitat
on Tape grass, Posidonia, probably restricted to coasts with moderate wave
movement
Similar Species
the flat, blade form of Enteromorpha compressa, but cells are smaller and only in
short lines in that species
Description in the Benthic Flora Part I, pages 153, 155-157
Details of Anatomy
Enteromorpha (Ulva) linza
(Linnaeus) J Agardh
Enteromorpha linza stained
blue and viewed
microscopically to show:-
1.
cells in lines, some forming arcs around
growing points (arrowed) (
A53344 slide 20780
)
2.
a cross section showing the 2 cell layers of
rectangular cells practically touching except at
the very edge where a narrow cavity exists
(arrowed) (
A53312 slide 7586
)
3.
a surface view of cells showing the single
bright spot (pyrenoid) in each chloroplast,
enhanced by Nomarski interference technique
(
A53344 slide 20780
)
MACRO
PLANT
!
Diagnosis can be difficult
1.
2.
3.
foliose
* Descriptive names are inventions to aid identification, and are not commonly used
“Algae Revealed” R N Baldock, S Australian State Herbarium, March 2009, additions October 2009
Specimens of Enteromorpha (Ulva) linza (Linnaeus) J Agardh, (short stalks arrowed)
4.
on Posidonia, 1.5m deep, Rosetta Bay, Victor Harbor, S Australia (
A42719
)
5.
0-1.0m deep, Port Phillip, Victoria (
A53344
)
4.
5.