vaginula


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vaginula

(vəˈdʒɪnjʊlə)
n
(Botany) a little sheath, as found on the stalk of mosses
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The lower portion of the sporophyte is referred to as the foot and is deeply inserted into the surrounding gametophyte tissue, which forms a multi-layered sheath or vaginula around it (Ligrone & Gambardella, 1988).
Perichaetia lateral on stem; inner perichaetial leaves straight, plicate, lanceolate, erect, margin entire, apex acuminate, costa absent or sometimes short and single, cells fusiform to linear, thin-walled and smooth; vaginula with paraphyses.
Perichaetia lateral on stem; inner perichaetial leaves straight, not plicate, ovate-lanceolate, erect, margin entire or irregularly denticulate near apex, apex shortly acuminate, sometimes rounded or obtuse, costa single, usually rudimentary, cells fusiform, porose and smooth; vaginula naked.
Perichaetia lateral on stem; inner perichaetial leaves straight, not plicate, ovate-lanceolate, erect, margin entire or slightly sinuate, apex abruptly and shortly to longly acuminate, costa long and single, almost reaching the apex, cells linear, thin-walled, smooth, sometimes initial cells of rhizoids present in upper part of perichaetial leaves; vaginula naked.