Arceuthobium campylopodum subsp. monticola

(Hawksworth

Wiens & Nickrent) Nickrent, Phytoneuron 2012-51: 10. 2012.

Common names: Western white pine dwarf mistletoe
Endemic
Basionym: Arceuthobium monticola Hawksworth Wiens & Nickrent, Novon 2: 205. 1992
Treatment appears in FNA Volume 12. Treatment on page 432. Mentioned on page 429, 433.

Plants forming localized infections only. Stems olive green or brown, 5–7 (–10) cm; third internode 8–12 (–15) × 1.5–1.7 (–2) mm, dominant shoot 2–4 mm diam. at base. Staminate flowers 3 mm diam.; petals 3. Fruits 4–4.5 × 2–2.5 mm.


Phenology: Flowering Jul–Aug; fruiting Oct–Nov.
Habitat: Coniferous forests, especially with western white pine.
Elevation: 700–1900 m.

Discussion

Meiosis likely occurs in July, with fruits maturing 15 months after pollination.

The principal host of subsp. monticola is Pinus monticola; secondary to rare hosts include Picea breweriana, Pinus jeffreyi, and P. lambertiana. It is endemic to the Klamath and Siskiyou Mountains.

Selected References

None.

Lower Taxa

None.
Daniel L. Nickrent +
(Hawksworth +
Arceuthobium monticola +
brown +, orange +, yellow +, olive green +  and yellowish green +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.3 cm3 mm <br />0.003 m <br /> (?) +
scale-like +
10 cm100 mm <br />0.1 m <br /> (22 cm220 mm <br />0.22 m <br />) +
3 cm30 mm <br />0.03 m <br /> (?) +  and 10 cm100 mm <br />0.1 m <br /> (?) +
Western white pine dwarf mistletoe +
spikelike +
Calif. +  and Oreg. +
700–1900 m. +
globose +  and pyriform +
3 cm30 mm <br />0.03 m <br /> (?) +
lenticular +
0.4 cm4 mm <br />0.004 m <br /> (?) +  and 0.45 cm4.5 mm <br />0.0045 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.25 cm2.5 mm <br />0.0025 m <br /> (?) +
Coniferous forests, especially with western white pine. +
terminal +  and axillary +
bisexual +  and unisexual +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
connate +
scale-like +
pinnate +  and entire +
articulated +
asymmetric +  and symmetric +
yellowish green +
connate +  and distinct +
deltate +  and triangular +
Flowering Jul–Aug +  and fruiting Oct–Nov. +
2[-3]-carpellate +
Wiens & Nickrent) Nickrent, Phytoneuron +
mucilaginous +
0.33 cm3.3 mm <br />0.0033 m <br /> (?) +  and 0.55 cm5.5 mm <br />0.0055 m <br /> (?) +
pyriform +  and ellipsoid +
0.23 cm2.3 mm <br />0.0023 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
3 +  and 4 +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
brown;olive green +
pendulous +  and erect +
fanlike +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
undifferentiated +
Razoumofskya campylopoda +
Arceuthobium campylopodum subsp. monticola +
Arceuthobium campylopodum +
subspecies +
spikelike +
mucilaginous +
evergreen +  and perennial +