perigynium


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perigynium

[‚per·ə′jin·ē·əm]
(botany)
A fleshy cup- or tubelike structure surrounding the archegonium of various bryophytes.
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Perigynia 3-3.4 mm long, 1.4-1.5 mm wide, trigonous, greenish, opaque, slightly pubescent, 11-15-veined, base stipitate-like (when dried); perigynium beak less than 0.5 mm long, orifice more or less truncate.
2 mm long and 1.2 mm wide, trigonous with elliptical sides, pale brown, occupying upper two-thirds of perigynium body.
Achenes trigonous with elliptical or slightly obovate sides, the body 1.2-1.6 mm long and 0.7-1 mm wide, loosely enveloped by perigynium, dark brown, stipitate with stipes 0.6-1 mm long and ca.
1D), differs from the mainland species by having appreciably smaller perigynia, a shorter cylindrical perigynium beak, and achenes with shorter stipes (see Fig.
Rachilla 5.5-7 mm long, projecting beyond orifice of perigynium, exserted portion 2.8-4.4 mm long, smooth, greenish or brownish, the hook 1.1-1.3 mm long and stramineous or pale brown (particularly the descending part).
Rachilla 5.2-6.2 mm long, projecting beyond orifice of perigynium, exserted portion 1.6-2.4 mm long, smooth, brownish, the hook 0.8-1.3 mm long and stramineous or brownish.
Perigynia (3.5-)4-5.2 mm long, 1.4-1.9 mm wide, elliptic to broadly elliptical, abaxially and adaxially appressed hispid distally and smooth (or nearly so) proximally, the margins ciliate-scabrous above the middle, stramineous but often with brown maculations or brownish, 2 prominent veins and the others obscure or weak proximally on both faces, gradually tapered to a puckered base (when dry); perigynium beak 0.4-0.8 mm long, smooth or appressed hispid proximally, the margins smooth distally and ciliate-scabrous proximally, orifice entire or slightly erose.
macrolepis Apex of achene pale-colored and conspicuously thickened; lowest pistillate scale usually more than 5.5 mm long (excluding awn, if present); spikes 1.5-4 cm long, more or less loosely-flowered; perigynium smooth but sometimes sparingly hispidulous distally, 1.2-1.6 mm wide; primarily in bogs and in other Sphagnum-laden sites Uncinia austroamericana Apex of achene not pale-colored and very little thickened; lowest pistillate scale 5.5 mm long or less (excluding awn, if present); spikes 1-2 cm long, tightly-flowered; perigynium appressed hispid (at least distally), 1.4-1.9 mm wide; primarily in wet depressions in grasslands and meadows Uncinia macrolepis A FIRST REPORT OF UNCINIA CHILENSIS FROM ARGENTINA
macrolepis Culm height (cm) 4-30(-45) 2.5-18 Spike length (cm) 1.5-4 1-2 Spike aspect more or less tightly-flowered loosely-flowered Perigynium length (mm) 5-6 (3.5-)4-5.2 Perigynium width (mm) 1.2-1.6 1.4-1.9 Perigynium vestiture, usually smooth, but abaxially and degree of sometimes distally adaxially sparingly appressed hispid hispidulous distally, smooth abaxially and proximally adaxially Achene length (mm) 3-3.6 2.2-3.2 Lowest pistillate generally > 5.5 5.5 or less scale length (mm) Habitats bogs, poor fens, moist depressions in swampy woodlands, grasslands, other Sphagnum- meadows, laden sites heathlands
The synapomorphies shared by these three species are entire or sparsely serrulate perigynium beaks (#9, also possessed by C.
Granulares: lateral spikes with 25 or more perigynia per spike (#22), perigynia loosely enveloping the achenes (#29), and perigynium epidermis with scattered pigment cells (#47).
Perigynium shape: widest near middle (0), widest at or very near base (1) 6.