True Mosses - Evolution and Diversity of Plants - Lab Manual, Study notes for Biology. Bengal Engineering & Science University

Biology

Description: This lecture is from Evolution and Diversity of Plants. Key important points of lab manual are: True Mosses, Moss Archegonia, Moss Capsule, Mnium Sporophyte, Polytrichum Sporophyte, Filamentous Protonema, Jacket Cells, Sperm Mass, Perigonial Leaves, Filamentous Protonema
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Evolution and Diversity of Plants Lab 9 - True Mosses
A) DRAW
1) Moss Archegonia (Slide)
Draw the tip of a female moss, indicating the following structures with labels: perichaetial
leaves (i.e., leaves on the edge of the stem tip), 3-4 female gametangia (= archegonia),
paraphyses, venter region, neck region, egg, ventral canal cell, neck canal cells, neck cells
2) Moss Antheridia (Preserved)
Draw the tip of a male moss, indicating the following structures with labels: perigonial leaves
(i.e., leaves on the edge of the stem tip), 4-5 male gametangia (= antheridia), jacket cells,
sperm mass, paraphyses
3) Moss Sporangium = Moss Capsule (Slide l.s.)
Draw a moss sporangium (= “capsule”), indicating the following structures with labels:
sporangium wall, columella, spore chamber, spores (or sporocytes, depending on maturity),
operculum, annulus (if visible), peristome teeth
B) OBSERVE (if available)
1) Mnium sporophyte (Preserved)
Be sure you can identify the following structures on this sporophyte: seta, sporangium (=
capsule), calyptra, operculum, columella, spore chamber
2) Polytrichum sporophyte (Preserved)
Be sure you can identify the following structures on this sporophyte: seta, sporangium (=
capsule), calyptra, operculum, columella, spore chamber, epiphragm (note that in
Polytrichum, the peristome teeth are highly reduced; the opening of the sporangium is
covered by a membrane referred to as an epiphragm)
3) Moss Protonema. (Slide - w.m.)
Examine the young moss gametophyte (= protonema). Be able to identify germinating spore
and filamentous protonema.
4) Moss Archegonia (Preserved)
Be sure you can identify the following: perichaetial leaves (i.e., leaves on the edge of the
stem tip), paraphyses, female gametangia (= archegonia), venter region, neck region, egg,
ventral canal cell, neck canal cells, neck cells
5) Moss Antheridia(Preserved)
Be sure you can identify the following: perigonial leaves (i.e., leaves on the edge of the stem
tip), paraphyses, antheridia, jacket cells, sperm mass
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