The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

fissidens moss

fissidens moss

Habit Plants to 25 × 3.5 mm. Plants to 6 × 1.5 mm.
Stem

usually branched;

axillary hyaline nodules absent;

central strand present.

usually branched;

axillary hyaline nodules absent;

central strand present.

Leaves

as many as 25 pairs, often undulate, oblong to lanceolate, obtuse to acute, often apiculate, to 3.5 × 0.7 mm;

dorsal lamina truncate-rounded proximally, ending at insertion, not decurrent;

vaginant laminae 2/3 the leaf length, ± unequal, minor lamina ending near margin;

margin crenulate to crenulate-serrulate but unevenly serrate at leaf apex, elimbate;

costa ending a few cells before apex to percurrent, taxifolius-type;

laminal cells irregularly 2-stratose in dorsal and ventral laminae, ± obscure, smooth, bulging, firm-walled, rounded-hexagonal, 7–10 µm, 3–4 rows of marginal cells thinner, walls slightly thicker, forming a pale marginal band.

as many as 22 pairs, ovate to lanceolate, rounded to obtuse-apiculate, apiculus formed of a single, clear, sharp cell, to 1 × 0.1–0.4 mm, perichaetial and larger leaves oblong to oblong-ligulate and lanceolate;

dorsal lamina usually narrowed abruptly proximally, often arched, ending well before insertion;

vaginant laminae 1/2–3/4 leaf length, ± equal, minor lamina ending on or near margin;

margin ± entire but serrulate distally, elimbate or limbate, limbidium 1-stratose, restricted to vaginant laminae or found to variable degrees on all laminae, often conspicuously intralaminal in proximal parts of vaginant laminae;

costa ending 2–5 cells before apex or percurrent, bryoides-type;

laminal cells 1-stratose, smooth, strongly bulging, ± obscure, usually arranged in discernable rows distally, firm-walled, 6–10 µm, twice as deep as wide.

Seta

to 11 mm.

to 5 mm.

Sexual condition

dioicous;

perigonia on short axillary branches and elongate stems;

perichaetia on short axillary branches, mostly near proximal ends of stems.

cladautoicous, gonioautoicous, and possibly rhizautoicous.

Capsule

theca slightly inclined, slightly arcuate, bilaterally symmetric, to 1.8 mm;

peristome taxifolius-type;

operculum 1–1.4 mm.

theca exserted, slightly inclined, bilaterally symmetric to erect, radially symmetric, to 1 mm;

peristome bryoides-type;

operculum 0.3 mm.

Calyptra

cucullate, smooth, 1.8 mm.

cucullate, smooth, 0.6 mm.

Spores

13–20 µm.

14–23 µm.

Sporophytes

1 per perchaetium.

1 per perichaetium.

Fissidens dubius

Fissidens sublimbatus

Habitat Soil and humus, bases of trees, decaying wood, rocks and boulders in moist, shaded sites Soil in arid areas, where plants are often partially buried, often under overhanging rocks and boulders, and in the shade of trees and shrubs
Distribution
from FNA
AK; AL; AR; AZ; CA; CT; DE; FL; GA; IA; IL; IN; KS; KY; MA; ME; MI; MN; MO; MS; NC; NE; NH; NY; OK; PA; SC; TN; TX; VA; VT; WI; WV; NB; NF; NS; ON; QC; Mexico; Central America; West Indies; Europe; Asia; Pacific Islands
[WildflowerSearch map]
from FNA
AZ; CA; CO; KS; NM; NV; OK; TX; UT; WY; AB; Mexico; South America (Argentina); Africa
Discussion

In contrast to Fissidens adianthoides, F. dubius has smaller, irregularly 2-stratose, obscure laminal cells. Subterranean, irregularly globose, multicellular rhizoidal gemmae have been reported for F. dubius as well as F. osmundioides and F. taxifolius in Europe and Japan. Z. Iwatsuki and T. Suzuki (1982) cited the occurrence of dwarf male plants (small perigonial stems located on the leaves of perichaetial plants) in Japanese specimens.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Fissidens sublimbatus is closely allied to F. crispus but is restricted to arid habitats. Indeed, it appears to be the only species of the genus found in Death Valley. Stems of F. sublimbatus are dimorphic, unlike the monomorphic stems of F. crispus. Leaves of infertile stems are small, ovate-lanceolate and usually apiculate, the apiculus formed by a single, clear, sharp cell. The dorsal lamina in these leaves usually ends well before the insertion, are often arched, and the limbidium is most often restricted to the vaginant laminae but can be absent. The 1-stratose limbidium is best developed on perichaetial and larger leaves, but ends below the leaf apex and is usually edged by distinctly chlorophyllose cells. The percurrent costa occurs mostly in perichaetial leaves. As in F. crispus, the distal laminal cells are arranged in distinct rows.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 27, p. 340. FNA vol. 27.
Parent taxa Fissidentaceae > Fissidens Fissidentaceae > Fissidens
Sibling taxa
F. adianthoides, F. amoenus, F. aphelotaxifolius, F. appalachensis, F. arcticus, F. asplenioides, F. bryoides, F. bushii, F. closteri, F. crispus, F. curvatus, F. elegans, F. exilis, F. fontanus, F. grandifrons, F. hallianus, F. hyalinus, F. leptophyllus, F. littlei, F. minutulus, F. obtusifolius, F. osmundioides, F. pallidinervis, F. pauperculus, F. pellucidus, F. polypodioides, F. santa-clarensis, F. scalaris, F. serratus, F. subbasilaris, F. sublimbatus, F. submarginatus, F. taxifolius, F. taylorii, F. ventricosus, F. zollingeri
F. adianthoides, F. amoenus, F. aphelotaxifolius, F. appalachensis, F. arcticus, F. asplenioides, F. bryoides, F. bushii, F. closteri, F. crispus, F. curvatus, F. dubius, F. elegans, F. exilis, F. fontanus, F. grandifrons, F. hallianus, F. hyalinus, F. leptophyllus, F. littlei, F. minutulus, F. obtusifolius, F. osmundioides, F. pallidinervis, F. pauperculus, F. pellucidus, F. polypodioides, F. santa-clarensis, F. scalaris, F. serratus, F. subbasilaris, F. submarginatus, F. taxifolius, F. taylorii, F. ventricosus, F. zollingeri
Synonyms F. adianthoides var. semicristatus, F. cristatus, F. cristatus var. winonensis, F. decipiens var. winonensis, F. floridanus F. obtusifolius var. apiculatus
Name authority P. Beauvois: Prodr. Aethéogam., 57. (1805) Grout: Moss Fl. N. Amer. 1: 13, plate 13, fig. A. (1936)
Web links