POC Conf. Call 4-12-11
POC meeting, Webex Conference Call; Date: Tuesday April 12th, 2011 10am (PDT)
In attendance:
POC members:
Absent:
Collaborators:
Acceptance of the minutes from the POC_Conf._Call_4-5-11?
Items arising from last week's meeting:
Sporangium and its parts
This is continued from our discussion at the POC_Conf._Call_3-8-11
Plant Tissues
paraphyllium - Tiny filaments, scales or leaf-like structures scattered on the stems of some leafy bryophytes. Bill and Nancy Malcolm (2006): Mosses and other Bryophytes, an illustrated glossary, second edition (MO definition)
Crum defines them as "Small green outgrowths formed between the leaves on stems and branches of some pleurocarps (mosses that produce archegonia and sporophytes laterally, rather than on the tips of their axes) and a very few leafy liverworts."
Schofield describes paraphyllia as outgrowths of the epidermis, but he also describes leaves that way.
MO has this listed as a plant organ
Proposed definition: A phyllome/portion of plant tissue that is a small outgrowth from the epidermis between the leaves of a gametophore axis.
Comment: Paraphyllia are much smaller than leaves and may be filamentous, scale-like, or leaf-like. Found in pleurocarpous mosses and a few leafy liverworts.
The paraphyllia are the small, dark structures between the leaves.
midrib
rhizoid
archesporium
amphithecium
endothecium
jacket layer
paraphysis
axilliary hair
tmema
Plant Cells
Terms requested by MO:
archesporial cell
apical cell
shoot apical cell
phyllid apical cell
alar cell
brachycyte
chloronema cell
caulonema cell
tmema cell
jacket layer cell
axillary hair terminal cell
axillary hair base cell
neck canal cell
side branch initial
Other terms, not requested by MO:
hyrdoid
leptoid
rhizoid initial
