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Published In: Bulletin de l'Herbier Boissier 6: 96. 1898. (Bull. Herb. Boissier) Name publication detailView in Biodiversity Heritage Library
 

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Discussion:

Macromitrium podocarpi has enlarged, swollen teeth on its basal leaf margins which places it Macromitrium-group 3. Its basal marginal teeth are well-developed on leaf decurrencies and they are best seen on leaves still attached to the stems. In general aspect, however, M. podocarpi is much closer to M. microstomum, M. richardii, and M. sharpii – all are small mosses with strongly creeping stems and crispate to inrolled leaves – than to the other member of group 3. Macromitrium microstomum differs from M. podocarpi in having non‑tuberculate, elongate basal leaf cells in the lower _ of the leaf and puckered capsules. Macromitrium richardii is distinguished from M. podocarpi by its pluripapillose upper leaf cells, non-tuberculate basal leaf cells, and puckered capsules. Vitt (1979) distinguished M. sharpii from M. podocarpi by its smooth capsules, strongly bulging upper leaf cells and fewer elongate basal leaf cells. These features, however, are variably expressed in both species and will not consistently distinguish them. In general, M. sharpii has more strongly tuberculate basal cells, fewer elongate basal cells, and more broadly acute leaf apices than those of M. podocarpi, but the two are most clearly distinguished by the enlarged basal marginal teeth of M. podocarpi.

The type of M. podocarpi was issued by Ule as number 222 of his Bryotheca Brasiliensis exsiccati and not number 227 as reported by Grout (1946). Macromitrium portoricense differs from M. podocarpi only in having smooth capsules. Although the capsules of M. podocarpi are often strongly furrowed the species is extremely variable in this respect with some collections of M. podocarpi having wrinkled to nearly smooth capsules.
Illustrations: Williams (1929, Pl. 5); Churchill and Linares (1995, Fig. 135 a–f). Fig. 206.
Habitat: On bark of tree trunks and branches; 1110–1910 m.
Distribution in Central America: HONDURAS. Atlántida: Allen 17403 (MO, TEFH);  Comayagua: Allen 14036 (MO, TEFH); Lempira: Allen 11121B (MO, TEFH); Olancho: Allen 12458 (MO, TEFH). COSTA RICA. Alajuela: Brenes 20431 (FH); Cartago: J. Gentry & Burger 2944 (MO); Puntarenas: Townsend 93-374 (herb-Townsend); San José: Standley 41677 (FH, NY, US). PANAMA. Chiriquí: Croat 15877 (MO, PMA).
World Range: Central America; Caribbean, Western and Northern South America, Brazil.

 

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Macromitrium podocarpi C. Müll., Bull. Herb. Boissier 6: 96. 1898.

Protologue: Brazil. Brasilia, Minas Geraës, Serra Itabira do Campo, ad truncos arborum, Aprili 1892, E. Ule, Coll. N° 1066 (NY, as Bryotheca brasiliensis 222).

Macromitrium portoricense Williams, Bryologist 32: 69. 1929. Protologue: Puerto Rico. On road between Maricao and Monte Alegrillo, Porto Rico, at 500–900 meters, on exposed rock. No. 2638. Elizabeth G. Britton, April 13, 1913 (NY), syn. nov.

Plants slender, yellow‑green to dark green. Stems strongly creeping, branches 1.0–1.5(–3.0) cm long, densely red‑tomentose at base. Leaves moderately keeled, erect below, crispate to flexuose‑contorted above when dry, erect‑spreading when wet, 1.5–2.2 x 0.5 mm, lanceolate; apices broadly acute to obtusely‑apiculate; margins entire or crenulate, recurved or plane below, plane above, enlarged basal teeth at leaf insertion present; costae percurrent or excurrent into a short apiculus; upper interior cells 6–12 μm, rounded to hexagonal‑rounded, bulging mammillose, upper marginal cells not differentiated, basal cells to 40 μm long, long‑rectangular, incrassate and porose, tuberculate. Setae 4–5 mm long, smooth. Capsules 1–1.5 mm long, cylindrical to oblong‑ovate, weakly or strongly furrowed, at times only wrinkled; opercula rostrate, to 1 mm long; annuli non‑revoluble, with fragments adhering to capsule mouth; exostome teeth lanceolate, 160–180 μm high, whitish, densely papillose, united forming an erect membrane, endostome hyaline, weakly papillose, basal membrane 80 μm high, segments 100 μm high. Spores anisosporous, 10–14 μm, smooth, thin‑walled and 16–28 μm, weakly papillose, thick‑walled. Calyptrae mitrate, laciniate, naked, to 2.5 mm long.

 

 
 
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