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fissidens moss, water pocket moss

fissidens moss

Habit Plants to 120 × 6 mm. Plants to 12 × 1.5–3.5 mm.
Stem

usually profusely branched;

axillary hyaline nodules absent;

central strand absent.

branched;

axillary hyaline nodules absent;

central strand present.

Leaves

in numerous pairs, lanceolate to linear-lanceolate, frequently somewhat falcate, acute, to 7 × 0.6 mm;

dorsal lamina narrowed proximally, usually ending before insertion;

vaginant laminae 1/3–1/2 the leaf length, unequal, minor lamina usually rounded and free distally or narrowed and ending on or near costa;

margin ± entire, elimbate;

costa ending 15–35 cells before apex, bryoides-type;

laminal cells usually 1-stratose, sometimes 2-stratose juxtacostally, quadrate to short-oblong to hexagonal, smooth, slightly bulging, ± firm-walled, 15–23 × 10–18 µm in dorsal and ventral laminae, juxtacostal cells largest.

as many as 28 pairs, sometimes ± undulate, oblong, obtuse-apiculate to acute, to 2.4 × 0.3–0.4 mm;

dorsal lamina narrowed proximally, ending before or at insertion;

vaginant laminae 1/2–2/3 leaf length, acute, ± unequal, minor lamina ending near margin;

margin evenly crenulate-serrulate but irregularly serrate distally;

costa ending 6–16 cells before apex, covered and obscured above by chlorophyllose cells, taxifolius-type;

lamina cells irregularly 2-stratose, smooth, bulging, firm-walled, irregularly rounded-hexagonal, 7.5–10 µm. Sexual condition gonioautoicous and cladautoicous;

perigonia gemmiform, axillary, and on short branches;

perichaetia on short axillary branches near proximal ends of stem.

Seta

0.5–0.6 mm.

1.5–5.5 mm.

Sexual condition

gonioautoicous and cladautoicous;

perigonia and perichaetia on short axillary branches, 1–5 per leaf axil, sometimes on elongate, axillary branches.

Capsule

theca 0.5–0.6 mm, erect, radially symmetric;

peristome anomalous, irregularly divided, ± incomplete, often truncate, papillose;

operculum as long as seta.

theca 0.8–2.1 mm, erect, radially symmetric or nearly so;

peristome taxifolius-type;

operculum long rostrate, 0.6–0.9 mm.

Calyptra

mitrate, smooth.

cucullate, smooth, 1.5 mm.

Spores

18–27 µm.

13–18 µm.

Sporophytes

1–5 per leaf axil, inconspicuous.

1 per perichaetium.

Fissidens fontanus

Fissidens subbasilaris

Habitat Attached to various substrata in stagnant and flowing water, and in coastal estuaries Particularly around bases of trees, also rocks, mostly limestone, infrequently decaying wood
Distribution
from FNA
AL; AR; AZ; CA; CT; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; ME; MI; MN; MO; MS; MT; NC; NJ; NM; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; WA; WI; WV; BC; ON; Mexico; Central America; West Indies; Europe; Africa
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from FNA
AL; AR; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MO; MS; NC; NH; NY; OH; OK; PA; SC; TN; TX; VA; WI; WV; ON; QC; Mexico (San Luis Potosí, Tamaulipas)
[WildflowerSearch map]
Discussion

Fissidens fontanus and F. hallianus are aquatic species usually found in stagnant or slow moving water, but at times emergent because of fluctuating water levels (H. A. Crum and L. E. Anderson 1981; P. G. Davison and D. E. Wujek 1999). Plants of both species are usually profusely branched, delicate, and feathery in appearance with leaves often 10 times or more as long as wide. Often plants are encrusted with diatoms. Stems and leaves might also appear black due to deposition of organic matter. When dry the leaves are unusually fragile so that when being prepared for herbarium storage it is best to float plants onto sheets prior to drying.

A suite of gametophytic and sporophytic characters distinguishes Fissidens fontanus. The unequal vaginant laminae are about 1/4–1/3 the leaf length, and minor lamina is round and more or less free distally. In addition, costa ends well below the leaf apex. In fertile specimens, the clusters of 1–5 axillary, inconspicuous, dark sporophytes in each perichaetium are distinctive. The sporophytes, more prevalent than thought, are caducous and are often found in the bottom of the herbarium packets. The short seta is equal in length to that of operculum, and peristome teeth are greatly reduced, often consisting of only the truncated, undivided basal parts.

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

Fissidens subbasilaris is distinguished, even in the field, by a costa obscured by chlorophyllose cells distally, and short perichaetial branches in the axils of proximal leaves. The plants are typically dark-green and often tinged with red.

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

Source FNA vol. 27, p. 343. FNA vol. 27, p. 342.
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. dubius, F. elegans, F. exilis, 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. sublimbatus, F. submarginatus, F. taxifolius, F. taylorii, F. ventricosus, F. zollingeri
Synonyms Skitophyllum fontanum, Octodiceras julianum var. ohioense, F. debilis, F. julianus
Name authority (Bachelot de la Pylaie) Steudel: Nomencl. Bot. 2: 166. (1824) Hedwig: Sp. Musc. Frond., 155, plate 39, figs. 6–9. (1801)
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