Fissidens curvatus |
Fissidens amoenus |
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Habit | Plants 1.2–10 × 1–2.5 mm. | Plants to 4.5 × 1.5 mm. |
Stem | unbranched and branched; axillary hyaline nodules present; central strand weak or absent. |
unbranched; axillary hyaline nodules present; central strands absent. |
Leaves | as many as 25 pairs, narrowly lanceolate to ovate–lanceolate, acute to sharply acute to short acuminate, to 1.9 × 0.3; dorsal lamina narrowed proximally, ending before or at insertion, infrequently ± decurrent; vaginant laminae 1/2–4/5 leaf length, ± equal, minor lamina ending on or near margin; margin entire, limbate on all laminae, limbidium confluent at apex or ending shortly before apex, extending to base of dorsal lamina, limbidial cells 2–3-stratose; costa percurrent to excurrent, bryoides-type; laminal cells 1-stratose, distinct, smooth, ± bulging, firm-walled, elongate, 7–22 × 4–13 µm, increasing in size toward proximal part of leaf. |
as many as 10 pairs, ligulate to lanceolate, acute, usually apiculate, to 1.8 × 0.25 mm; dorsal lamina narrowed proximally, ending at insertion, not decurrent; vaginant laminae ± 1/2 leaf length, acute, ± unequal, minor lamina ending near margin; margin ± evenly crenulate-serrulate, elimbate except for weak limbidium on proximal parts of vaginant laminae of perichaetial leaves; costa percurrent to ending as many as 5 cells before apex, bryoides-type; laminal cells 1-stratose, distinct, smooth, often strongly bulging, firm-walled, irregularly quadrate to hexagonal, 8–11 µm, larger and ± oblong juxtacostally in proximal parts of vaginant laminae. |
Seta | to 12 mm. |
to 5 mm. |
Sexual condition | rhizoautoicous; perigonia gemmiform, proximal to infertile and fertile stems. |
rhizautoicous and gonioautoicous. |
Capsule | theca exserted, ± erect, radially symmetric to inclined, arcuate, bilaterally symmetic, 0.35–1.25 mm; peristome bryoides-type; operculum 0.25–0.3 µm. |
theca exserted, erect, radially symmetric, to 0.6 mm; peristome bryoides-type; operculum 0.5 mm. |
Calyptra | cucullate, smooth, 0.5 mm. |
cucullate, smooth, 0.5 mm. |
Spores | 11–18 µm. |
11–16 µm. |
Sporophytes | 1 per perichaetium. |
1 per perichaetium. |
Fissidens curvatus |
Fissidens amoenus |
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Habitat | Bare, shaded soil, often among grasses in open Quercus forests and around bases of coastal shrubs | Soil of stream banks and ravines, bases of trees in cypress-gum swamps, sometimes on rotting wood |
Distribution |
CA; Mexico; South America; West Indies; Europe; Asia; Africa; Pacific Islands (New Caledonia, New Zealand); Australia |
AL; FL; LA; MS; NC; TX; Mexico; South America |
Discussion | Fissidens curvatus is distinguished by its delicate dimorphic stems, usually long excurrent costa, limbidium confluent at leaf apex, and slightly elongate laminal cells. The theca is usually arcuate but can also be erect. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
A small, attractive species, Fissidens amoenus can be recognized by its distinct laminal cells, crenulate-serrulate leaf margin, large, more or less oblong, pellucid cells in the proximal parts of the vaginant laminae, and weak limbidium restricted to the proximal parts of the vaginant laminae of perichaetial leaves. The laminal cells have been described as “inconspicuously 1-papillose” (H. A. Crum and L. E. Anderson 1981, as F. hallii), but since that condition is not always present it is perhaps best to regard these cells as strongly bulging. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 347. | FNA vol. 27, p. 348. |
Parent taxa | Fissidentaceae > Fissidens | Fissidentaceae > Fissidens |
Sibling taxa | ||
Synonyms | F. milobakeri | F. austinii, F. hallii, F. orcuttii |
Name authority | Hornschuch: Linnaea 15: 148. (1841) | Müller Hal.: Bot. Zeitung (Berlin) 5: 38. (1847) |
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