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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Vascular Plant Lab- True Mosses (2004)

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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