Arceuthobium campylopodum subsp. laricis

(M. E. Jones) Nickrent

Phytoneuron 2012-51: 9. 2012

Common names: Larch dwarf mistletoe
Basionyms: Arceuthobium douglasii var. laricis M. E. Jones Biol. Ser. Bull. State Univ. Montana. 15: 25. 1910
Synonyms: A. laricis (M. E. Jones) H. St. John Razoumofskya laricis (M. E. Jones) Piper
Treatment appears in FNA Volume 12. Treatment on page 432. Mentioned on page 429.
Plants forming witches' brooms. Stems green, olive green, maroon, or purple, 4(–6) cm; third internode 5–8(–14) × 1–1.3(–2.5) mm, dominant shoot 1.5–3 mm diam. at base. Staminate flowers 2.7 mm diam.; petals 3(–4). Fruits 3.5 × 2.5 mm.

Phenology: Flowering Jul–Aug; fruiting (Aug–)Sep(–Oct).
Habitat: Coniferous forests, especially with western larch or mountain hemlock.
Elevation: 600–2300 m.


V12 156-distribution-map.jpg

B.C., Idaho, Mont., Oreg., Wash.


Meiosis occurs in June, with fruits maturing 13–14 months after pollination.

Larix occidentalis and Tsuga mertensiana are the principal hosts for subsp. laricis; secondary to rare hosts include Abies grandis, A. lasiocarpa, Picea engelmannii, Pinus albicaulis, P. contorta, P. monticola, and P. ponderosa. This dwarf mistletoe is a major pathogen on larch in Idaho and Montana.

Selected References


Lower Taxa


AuthorDaniel L. Nickrent +
Authority(M. E. Jones) Nickrent +
BasionymsArceuthobium douglasii var. laricis +
Common nameLarch dwarf mistletoe +
DistributionB.C. +, Idaho +, Mont. +, Oreg. + and Wash. +
Elevation600–2300 m. +
HabitatConiferous forests, especially with western larch or mountain hemlock. +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering Jul–Aug + and fruiting (Aug–)Sep(–Oct). +
Publication titlePhytoneuron +
Publication year2012 +
ReferenceNone +
Source xml grained fna xml/V12/V12 156.xml +
Special statusEndemic +
SynonymsA. laricis + and Razoumofskya laricis +
Taxon familyViscaceae +
Taxon nameArceuthobium campylopodum subsp. laricis +
Taxon parentArceuthobium campylopodum +
Taxon ranksubspecies +
VolumeVolume 12 +