Philonotis fontana |
Philonotis longiseta |
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philonotis moss, spring moss |
philonotis moss |
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Habit | Plants small to large, in tufts, mats, or sods, light to dark green or yellowish, sometimes reddish or glaucous, reddish brown proximally. | Plants small, in lax to dense tufts, bright green, rufous proximally. | ||||||||
Stems | 1–16(–20) cm, erect, simple, irregularly branched, or with a subfloral whorl of innovations, tomentose proximally. |
1–3 cm, lax, simple or 2-fid, tomentose proximally. |
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Leaves | with distalmost rarely spiraled around stem, stiffly erect to erect or erect-spreading, less commonly catenulate, erect to erect-spreading when dry, erect to spreading or occasionally secund when moist, lanceolate to broadly ovate-lanceolate or ovate-subulate, 0.6–3 mm; margins revolute, serrulate throughout, teeth paired, appearing 2-fid due to their apposing position from contiguous cells, sometimes margins plane, teeth unpaired; apex gradually to abruptly acute to acuminate, sometimes obtuse; costa short- to long-excurrent (often subpercurrent in obtuse leaves), 320 µm wide at base, distal abaxial surface smooth or weakly prorulose; laminal cells prorulose at proximal ends on abaxial side and at proximal and distal ends on adaxial side; basal cells rectangular to oblong-hexagonal, 15–30 × 5–8 µm; juxtacostal cells at widest part of leaf 24–40 µm; distal cells linear to oblong-linear, 15–40 × 3–5 µm. Specialized asexual reproduction absent. |
laxly erect to erect, sometimes secund when dry, erect-spreading when moist, narrowly triangular-lanceolate, 1–2.5 mm; margins narrowly revolute, serrulate nearly throughout, teeth single or paired; apex acuminate; costa excurrent, abaxial surface weakly papillose; laminal cells long, narrow, more than 9:1, prorulose, prorulae pointed, projecting at extreme distal ends of cells; basal cells rectangular, shorter, broader than distal, to 45 × 12 µm; distal cells linear, 30–65 × 5–7 µm. Specialized asexual reproduction absent. |
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Seta | 2–5(–7) cm, straight. |
1.5–3.5 cm, straight or flexuose. |
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Sexual condition | dioicous; perigonia discoid. |
autoicous; perigonia gemmiform. |
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Capsule | 1–3.5 mm. |
1.8–2 mm. |
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Spores | ovoid to reniform, 18–30 µm. |
reniform, 26–33 µm. |
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Philonotis fontana |
Philonotis longiseta |
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Phenology | Capsules mature Feb–Dec. | |||||||||
Habitat | Soil, rock, wet embankments | |||||||||
Elevation | low to moderate elevations | |||||||||
Distribution | North America; Mexico; Europe; Asia; Africa; Atlantic Islands (Iceland)
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AL; AR; FL; GA; IA; KS; LA; MO; MS; NY; OH; OK; PA; SC; TX; VA; Mexico; West Indies (Puerto Rico); Central America (Costa Rica, Guatemala); n South America (Venezuela) |
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Discussion | Varieties ca. 40 (3 in the flora). Philonotis fontana has a Holarctic distribution with limited penetration into the montane tropics of both Eastern and Western Hemispheres. The leaves are plane, 2- or pluriplicate, sometimes falcate or falcate-secund. Even given its membership in seepage communities, where morphological plasticity is not uncommon, the extent of variation in this species is excessive. Many variants have been recognized but with little firm evidence to support the majority of them. E. Nyholm (1954–1969) was convinced that only through a series of cultivation, cytological and genetic studies could the immense variability within this polymorphic complex be properly evaluated. W. M. Zales (1973) was able to show by a comparison of cultured and field-derived plants which of the morphological characters were relatively stable and which were subject to environmental influence. His treatment of this complex, with minor deviation, is followed here. The core characters for the species complex are laminal cells prorulose at proximal ends on the abaxial side, juxtacostal cells near the leaf base 24–40 µm, teeth of the leaf margin typically paired and appearing 2-fid, and costa 320 µm wide at the leaf base. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Philonotis longiseta can be recognized by its flat, narrowly triangular leaves with forward projecting prorulae at the distal ends of laminal cells throughout the leaf. The perigonia are lateral and found just proximal to the perichaetia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 28, p. 111. | FNA vol. 28, p. 108. | ||||||||
Parent taxa | Bartramiaceae > Philonotis | Bartramiaceae > Philonotis | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Mnium fontanum | Bartramia longiseta | ||||||||
Name authority | (Hedwig) Bridel: Bryol. Univ. 2: 18. (1827) | (Michaux) E. Britton: Bryologist 14: 44. (1911) | ||||||||
Web links |