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Published In: Hooker's Journal of Botany and Kew Garden Miscellany 3: 51. 1851. (Hooker's J. Bot. Kew Gard. Misc.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 2/16/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/16/2011)
Discussion:

The genus Streptopogon is typically corticolous, reddish in color, and often has densely tomentose stems that lack a central strand. Its leaf cells are smooth, the costa has a single (dorsal) stereid band, and vegetative propagula are commonly found on the leaves. Sporophytically the genus has thick, cylindrical capsules, long, filamentous, spirally-twisted peristome teeth, and a large conic-mitrate (often scabrous-prorulose) calyptra. The genus is similar to Scopelophila in color, stem cross-section, leaf cell ornamentation, and costal morphology. Scopelophila differs from Streptopogon in its terricolous or saxicolous habit, sparsely distributed rhizoids, eperistomate capsules, and cucullate calyptrae.

Although the stems in Streptopogon are often densely tomentose it has relatively few rhizoidal initials. The thickly tomentose stems are the result of its densely branched (often at right angles) rhizoids. All species of Streptopogon have peristomes with fragile basal membranes and as a consequence the peristomes are often detached below the capsule mouths. Collections with only old capsules may appear gymnostomous because of this type of peristome loss.


 

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Streptopogon Wils. in Mitt., Kew J. Bot. 3: 51. 1851. 

Plants small to medium-sized, in tufts or mats, green, reddish  or yellowish green above, reddish brown below, corticolous. Stems smooth, erect, irregularly branched, central strand absent, cortical cells thin-walled, hyaline, uniform throughout; rhizoids thick, densely branched, with branches often at right angles. Axillary hairs 7–10 cells long, lower 1–3 cells brown. Leaves lanceolate, spathulate, or oblong, erect at base, keeled or concave, erect-incurved or crispate and contorted when dry, wide-spreading when wet; apices cucullate, acute, or acuminate; laminae unistratose; margins entire or serrate, bordered or unbordered; costa subpercurrent, percurrent or excurrent, guide cells and a single (dorsal) stereid or substereid band present, ventral surface layer of enlarged cells present or absent (the guide cells ventrally exposed); upper cells hexagonal, rhomboidal, or rectangular, firm-walled, at times bulging, smooth on both sides, basal cells rectangular, thin-walled, smooth, alar cells not differentiated. Dioicous or autoicous. Perichaetia and perigonia terminal. Setae smooth. Capsules exserted, cylindrical, erect, smooth; exothecial cells quadrate to rectangular, thin- or thick-walled; stomata in neck; opercula rostrate, annuli persistent, cells vesiculose or non-vesiculose; peristome teeth 16–32, filamentous, densely spiculose, twisted, basal membrane low or high. Spores granulate. Calyptrae conic-mitrate, papillose or smooth.

 

 
 
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