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!Macromitrium crosbyorum B.H. Allen & Vitt Search in The Plant ListSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenAfrican Plants, Senckenberg Photo GallerySearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font
 

Published In: Novon 8: 113. f. 1. 1998. (Novon) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 3/9/2011)
Acceptance : Accepted
Project data     (Last Modified On 3/9/2011)
Discussion:

Macromitrium crosbyorum is a large moss with undulate leaves and isodiametric, collenchymatous, mammillose to stoutly unipapillose upper leaf cells. It has long, narrow marginal leaf cells that form a variably distinct border. Macromitrium subcirrosum differs from it in having elongate upper leaf cells, an excurrent costa and elimbate leaves. Macromitrium scoparium is similar to M. crosbyorum in having limbate leaves, isodiametric upper leaf cells and tuberculate basal leaf cells but differs in having smaller, narrower, non‑undulate leaves and smooth to weakly bulging upper leaf cells.

Some leaves of M. crosbyorum have weakly developed limbidia and could be confused with those of M. cirrosum or M. oblongum. Macromitrium crosbyorum differs from both species in having broader, erect‑patent, undulate leaves and stoutly unipapillose upper leaf cells. Macromitrium cirrosum further differs from it in having smooth capsules and upper leaf cells in distinct longitudinal rows.
Illustrations: Allen (1998, Fig. 1). Fig. 229.
Habitat: On tree trunks, logs, and rocks; 3150–3333 m.
Distribution in Central America: COSTA RICA. Cartago: Holz CR00-707 (GOET, MO); San José: Crosby 3906 (MO). PANAMA. Bocas del Toro: Davidse et al. 25327 (CR, MICH, MO, NY, PMA, US).
World Range: Central America.

 

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Macromitrium crosbyorum Allen & Vitt in Allen, Novon 8: 113. 1998.

Protologue: Costa Rica. San José: along Inter American Highway, ca. 10 km NW of summit at La Ascensión, 9°37'N, 83°48'W, Crosby & Crosby 6089 (ALTA, CR, MO, NY, US).

Plants large, greenish red to yellowish red. Stems creeping to 7 cm, branches 2–3 cm long, reddish tomentose below. Leaves keeled, erect below, flexuose to spirally contorted and undulate above when dry, erect‑patent when wet, (3–)4–6 mm long, 1 mm wide, lanceolate; apices acuminate; margins undulate, serrate above, frequently serrulate to near the base, recurved below, erect to plane above, enlarged basal teeth at leaf insertion absent; costae percurrent; upper interior cells 8–20 μm, rounded and collenchymatous, isodiametric to rhombic, stoutly unipapillose to mammillose, upper marginal cells narrow and elongate forming a more or less distinct border, basal cells long-rectangular, incrassate and porose, densely tuberculate, 26–44 μm long. Dioicous. Setae 7–10 mm long, smooth. Capsules 1.5–2.0 mm long, ovoid to cylindrical, plicate; opercula rostrate, 1–1.5 mm long; annuli non‑revoluble, with fragments adhering to capsule mouth; exostome teeth truncate, 320–424 μm high, yellow, densely papillose‑striate, united and forming a membrane, more or less reflexed at tips, splitting into eight pairs of teeth with age, endostome hyaline, lightly papillose, basal membrane 80–90 μm high, segments 60–80 μm high. Spores anisosporous, 14–20 μm, smooth to lightly papillose and 30–48(–54) μm, densely papillose. Calyptrae mitrate, deeply laciniate, naked, 4–5 mm long.

 

 

 
 
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