Arceuthobium campylopodum subsp. microcarpum
Phytoneuron 2012-51: 10. 2012.
Common names: Western spruce dwarf mistletoe
Endemic
Basionym: Arceuthobium douglasii var. microcarpum Engelmann in J. T. Rothrock Rep. U.S. Geogr. Surv., Wheeler, 253. 1879
Synonyms: A. microcarpum (Engelmann) Hawksworth & Wiens
Plants forming witches brooms. Stems yellowish green, green, orange, red, maroon, or purple, 5 (–11) cm; third internode 5–9.3 (–16) × 1–1.5 (–2) mm, dominant shoot 1.5–3 mm diam. at base. Staminate flowers 2.3 mm diam.; petals 3 (–4). Fruits 3.5 × 2 mm.
Phenology: Flowering (Jul–)Aug–Sep; fruiting (Aug–)Sep(–Oct).
Habitat: Coniferous forests, especially with blue or Engelmann spruce.
Elevation: 2400–3200 m.
Discussion
Meiosis occurs in July, with fruits maturing 12 to 13 months after pollination.
Subspecies microcarpum is a serious pathogen on its principal hosts, Picea engelmannii and P. pungens, as well as on Pinus aristata in northern Arizona. Rare hosts include Abies lasiocarpa and Pinus strobiformis. Interestingly, this mistletoe is not found in the central Rocky Mountains where its principal hosts are most abundant.
Selected References
None.
Lower Taxa
None.
... more about "Arceuthobium campylopodum subsp. microcarpum"
dehiscing +
dehiscent +
glaucous +
brittle +
scale-like +
fleshy +
Western spruce dwarf mistletoe +
singly +
spikelike +
arising +
oriented +
bright green +
staminate +
asymmetric +
2.3 cm23 mm <br />0.023 m <br /> (?) +
unisexual +
lenticular +
3.5 cm35 mm <br />0.035 m <br /> (?) +
2 cm20 mm <br />0.02 m <br /> (?) +
dehiscent +
adnate +
absent +
5mm;9.3mm +
simple +
opposite +
connate +
scale-like +
parallel +
absent +
defined +
articulated +
inferior +
true +
staminate +
recurved +
absent +
epigynous +
opposite +
valvate +
yellowish green +
not persisting +
absent +
2[-3]-carpellate +
complex +
absent +
Phytoneuron +
2012 +
mucilaginous +
later +
sticky +
absent +
dominant +
Endemic +
branching +
whorled +
purple;maroon;purple;maroon;red;orange;green;yellowish green +
brittle +
secondary +
multiple +
fanlike +
5 cm50 mm <br />0.05 m <br /> (?) +
undifferentiated +
2-lobed +
absent +
absent +
Arceuthobium campylopodum subsp. microcarpum +
Arceuthobium campylopodum +
subspecies +
spikelike +
mucilaginous +
sticky +
branching +
fanlike +
parasitic +
dioecious +