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June 1 - 3 , 1978 - University of Hawaii at Manoa

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protected environment illustr<strong>at</strong>es the unusual n<strong>at</strong>ure <strong>of</strong> these<br />

gullies.<br />

Bark Communities<br />

The complex chemical n<strong>at</strong>ure <strong>of</strong> bark results in unique lichen<br />

communities on each tree or shrub species. Since chemical and<br />

physical surface characteristics change with the age <strong>of</strong> the bark,<br />

the associ<strong>at</strong>ed lichen communities also change. Thus the lichen<br />

community on twigs will be different from th<strong>at</strong> on the trunk. For<br />

example, the twigs and branches <strong>of</strong> mamane are colonized by<br />

Ochrolechia allescens H otrach na sinuosa, and species <strong>of</strong><br />

-<br />

candelaria, Bue o d a n e r e a s the trunk<br />

has Parmelia dominicana, Pannaria rubiginosa, and Heterodermia<br />

speciosa. Every other tree and shrub has its own spectrum <strong>of</strong><br />

species. ~onse&entlv, it is extremely difficult to describe the<br />

general distribition <strong>of</strong> bark-inhabiting species <strong>of</strong> lichens in any<br />

meaningful manner. Any <strong>at</strong>tempt to do so is beyond the scope <strong>of</strong><br />

this study which was not designed with this type <strong>of</strong> analysis in<br />

mind.<br />

The distribution <strong>of</strong> Usnea and Alectoria on pukiawe and<br />

'ohelo closelv .. ~arallels<br />

-<br />

the areas inund<strong>at</strong>ed bv cloud for sianificant<br />

periods. Usnea is found where clouds p;obably cover2 the<br />

area <strong>at</strong> least h a l f e days <strong>of</strong> the year whereas Alectoria smithii<br />

occurs in areas where the cloud cover is significantly less.<br />

RECOMMENDATIONS<br />

There are no formally design<strong>at</strong>ed thre<strong>at</strong>ened or endangered<br />

lichens. Th<strong>at</strong> does not mean th<strong>at</strong> there are no rare lichens.<br />

Even if they were to be listed there would be very little th<strong>at</strong><br />

could be done to promote the species other than habit<strong>at</strong> protec-<br />

tion and conserv<strong>at</strong>ion. As with many other groups studied during<br />

this survey, the removal <strong>of</strong> the feral herbivores would be a<br />

significant management action to preserve the lichen communities<br />

in the Park.<br />

LITERATURE CITED<br />

Magnusson, A. H. 1956. A c<strong>at</strong>alogue <strong>of</strong> the <strong>Hawaii</strong>an lichens.<br />

Ark. f.. Bot. 3: 223-402.<br />

Whiteaker, L. D. <strong>1978</strong>. The veget<strong>at</strong>ion and environment <strong>of</strong> the<br />

Cr<strong>at</strong>er District <strong>of</strong> Haleakala N<strong>at</strong>ional Park. M.S. Thesis in<br />

Botany, <strong>University</strong> <strong>of</strong> <strong>Hawaii</strong>, Honolulu. 159 pp.

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