Mesic northern forest. Leaves toothed. Apical cells of lamellae seemed flat-topped. Yellow setae with pale capsules.
mineral soil near stream.
Small plants in loose mats, somewhat complanate,
Leaves around stem, pointed out 60°
Toothy leaves with costa.
Stem leaves narrowly decurrent, broadly ovate-triangular to ovate-lanceolate, slightly concave, acute and toothy.
Branch leaves, more oval, blunt toothy tips
Seta smooth. Rhizoids.
Growing on soil of an occasionally mowed trailside in sun.
On soil bank on edge of trail. 23-644. Complicate bilobed with smaller lobe on top. Leaf lobes elongate with irregular teeth on margins. Single tooth at apex. Perianths oval, plicate, contracted to mouth. Mouth is toothed.
This is growing alongside a much larger Scapania species which can be seen in several of the photos as well.
Growing on bark of Ilex vomitoria, “Yaupon holly”, along with Frullania
Tourne County Park, on soil and tree base at edge of picnic area next to lowland woods and parking
The measured, dry patch of moss shows leaves tightly appressed. Even when wet, leaves remain somewhat appressed. Two views of the base of leaves are shown. They indicate the rather uniform band of cells extending its width. The leaf tip is shown. Mid-laminal cells are about 45 um. Leaves are about 1.3 mm. ovate-lanceolate, serrulate. Some leaves with one or two pleats; all somewhat concave. Alar cells are more or less quadrate. The moss was found on a fallen limb on ground in hardwoods.
12-12-20--13; median leaf cells 22.5 to 26.3 um wide (longest dimension); leaf width (mid point) 1.0 to 1.2 mm; lamellae shown (approx. 400x)
20201129--1
Additional images added 2-15-22 clearly showing lamellae; leaf sections mid leaf to ~2/3rds
ELC336 Vieille souche décomposée en bordure d'un sentier dans une forêt secondaire de feuillus perturbée. Colonie mixte avec Atrichum undulatum (ELC335)
Sporophytes présents, droit ou légèrement courbés. Cellules laminales 18-22 um de large. Lamelles (au nombre de 4-6, moyenne 4) hautes de 3-8 cellules (moyenne 5). Capsules dressées à légèrement arquées, plus étroites que celles des A. undulatum à proximité. Plante plus petite que A. undulatum. Même microhabitat que cette dernière espèce.
Deux dernière photos: Comparaison avec Atrichum undulatum poussant au même endroit. (à gauche: A. undulatum, à droite: A. altecristatum)
Among fallen leaves in soil on the island. Stems 1.5 to 2 cm. The moss leaves are 6-8 mm long, 0.6 to 0.8 mm wide with sharp tips. Very narrowly lanceolate. Midrib prominent with darker green and lighter green bands (are those lamellae?) . Near tip the ratio of midrib to width to that of leaf is less than or equal to 1/4.
Distal half, at most, toothed. Tips very sharp.
Last micrograph at 450x (2.2 microns per optical unit), next-to-last at 100x (11 microns) first four at 50x (32 microns)
Very hard call for me. Leaf shape and plant size goes with angustatum, but narrow midrib width relative to leaf width says no, points toward altecristatum or undulatum. Leaves do not seem wavy.
McKnight and Rohrer does not have A undulatum. A. undulatum in Lueth's Bildatlas looks like this more more than does his page on angustatum. He does not have altecristatum at least by that name.
The median leaf cells are very nonuniform in size, but overall longer on the axis at right angles to the midrib. Average length of fifteen haphazardly chosen by eye is 18 microns, average width 10. These dimensions go better with those given by Ireland for angustatum than with those in the same place for altecristatum .
I think this is the same species as that in https://www.inaturalist.org/observations/195116575 although my estimated leaf measurements on the latter have a wider leaf