Helodium blandowii

Helodium blandowii
Conservation status
Secure  (NatureServe)
Scientific classification
Kingdom:	Plantae
Division:	Bryophyta
Class:	Bryopsida
Subclass:	Bryidae
Order:	Hypnales
Family:	Helodiaceae
Genus:	Helodium
Species:	H. blandowii
Binomial name
Helodium blandowii (F. Weber & D. Mohr) Warnst.

Helodium blandowii, also known as Blandow's helodium moss,^[1] Blandow's tamarisk-moss,^[2] Blandow's bogmoss, and Blandow's feathermoss, is a rare plant in the Western U.S., including Oregon and California. It occurs all around the northern hemisphere in higher latitudes, and in some places is not as rare as in the Western U.S.

Technical description

• Plants yellow-green, in loose tufts: ascending even though pleurocarpous, regularly and closely pinnately branched, the branches all in one plane like a feather.
• Stems 4–11 cm long, more or less erect (quite stiff when dry), densely clothed in unbranched (but lobed) green filamentous paraphyllia becoming brown below.
• Branches unequal, simple, widely spaced on stem, about 1 cm long.
• Stem leaves large, more or less triangular-ovate, shortly and slenderly acuminate, somewhat plicate (concave), appressed except at the tips, with paraphyllia emanating from the decurrent leaf bases; margins plane or often revolute, entire or irregularly serrulate or dentate in the middle and lower part of the leaf; costa extending beyond the middle, 1.3–1.8 × 0.7–1 mm.
• Branch leaves small (about 0.8 mm long) and contorted when dry, broadly ovate-acuminate to ovate-lanceolate. Autoicous, the perigonia and perichaetia on the stems.
• Seta 3–5 cm long, slender, reddish brown.
• Capsules rare; when present, smooth, oblong-cylindric, becoming strongly arcuate (curved) and cernuous (incurved), the short neck somewhat wrinkled, the urn 2½–3½ mm long, yellowish-brown becoming reddish brown with age; operculum conic, pointed, to 0.8 mm long; annulus of 3 rows of deciduous cells; cilia 2–3, long, and more or less appendiculate.
• Spores smooth, mature in August.
• Calyptra cucullate.^{[3][4][5][6][7]}

Distribution, habitat, and ecology

This species has a circumboreal distribution.^[3]

The habitat of Blandow's bogmoss is montane minerotrophic or “moderately rich” fens or mires, usually with calcareous groundwater, where it forms mats and small hummocks; sometimes it can be found under graminoids and shrubs at the edges of these aquatic features, or within them in small rivulets. Associated vascular plants include Agrostis idahoensis, Betula glandulosa, Salix geyeriana, Carex limosa, Eleocharis pauciflora, and Scheuchzeria palustris. Associated mosses include Aulacomnium palustre, Calligeron stramineum, Hamatocaulis vernicosus, Meesia triquetra, Tomenthypnum nitens, Philonotis fontana, Drepanocladus vernicosus, and Hypnum lindbergii. Fens with Scorpidium spp. or Drepanocladus revolvens, however, are too ion-rich, and not suitable habitat for H. blandowii.^[3][6][8][9]

The fire ecology of this plant is not known; however, fens rarely burn. Excess soot from a nearby fire, however, might negatively affect habitat quality.

Conservation status and threats

U.S. Forest Service Pacific Southwest Region Sensitive Species.

California Native Plant Society List 2.3

NatureServe California State Rank: S1.3; Global Rank: G5

Fens are delicate habitats susceptible to impacts from livestock grazing, hydrologic alteration, construction and continued use of roads, and peat mining.^[3] Hydrologic alteration has caused the “well-documented extinction” of this species in Britain.^[10]

Field identification

This species is superficially similar to other, somewhat related mosses, but presence in a fen habitat significantly helps in identifying this moss. Its feather-like, flattened stems and branches are distinctive, as are its yellow-green colour and the presence of dense paraphyllia on the stems. The pale, yellow-green colour might at first glance look like Sphagnum, but H. blandowii can be distinguished by its pinnate growth habit, as opposed to the fasciculate habit of Sphagnum.^[3][5][7]

References

1. "Helodium blandowii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 4 February 2016.
2. Edwards, Sean R. (2012). English Names for British Bryophytes. British Bryological Society Special Volume. 5 (4 ed.). Wootton, Northampton: British Bryological Society. ISBN 978-0-9561310-2-7. ISSN 0268-8034.
3. Christy, John A.; David H. Wagner (1996). "VII". Guide for the Identification of Rare, Threatened, or Sensitive Bryophytes in the Range of the Northern Spotted Owl, Western Washington, Western Oregon, and Northwestern California: A Cooperative Project of the Eugene District, USDI Bureau of Land Management; Siuslaw National Forest, USDA Forest Service; The Nature Conservancy; and the Northwest Botanical Institute. p. 34.
4. Lawton, Elva (1971). "Moss Flora of the Pacific Northwest". Journal of the Hattori Botanical Laboratory. Supplement No. 1: 261.
5. Flowers, Seville; Arthur H. Holmgren (1973). "Helodium". Mosses: Utah and the West. The Blackburn Press. p. 399.
6. Vitt, Dale H.; Janet E. Marsh; Robin B. Bovey (1988). "Helodium blandowii". Mosses, Lichens, and Ferns of Northwest North America. Lone Pine Publishing. p. 85.
7. Norris, Daniel H.; James R. Shevock (2004). "Contributions toward a Bryoflora of California: II. A Key to the Mosses". Madroño. 51 (2): 198.
8. "Helodium blandowii". California Native Plant Society. Retrieved 05/01/2007. Check date values in: |access-date= (help)
9. Seyer, Susan C. (1979). "New Moss Species from Crater Lake National Park, Oregon". The Bryologist. The Bryologist, Vol. 82, No. 1. 82 (9): 82–83. doi:10.2307/3241974. JSTOR 3241974.
10. Porky, Ron; Nick Hodges (2005). "The Dawn of Bryophytes". Mosses and Liverworts. Collins. p. 53.

External links

• California Native Plant Society Rare Plant Inventory Article for Helodium blandowii
• NatureServe Web Page