| OCR Text |
Show 46 the lichen thallus before it reaches this environment. substrate. A maximum size in its potential The lichen itself may aid in quartzite substrate probably disintegration of the disintegrates much less rapidly. It is also possible that in this environment, s.l. 140 reaches senescence by the time it reaches 150 or (1968), the nearly The mm. Miller as s.l. largest. geographicum (1973), same and Birkeland a (1973), all the maximum found in this . geographicum diameter of about reported by Benedict in Colorado, study. Alaska and Sweden have found similar maximum diameters Karlen, 1973). larger ones as Baffin on cover maximum lichen estimates of the surface of the deposit, cover on any single boulder, maximum thallus diameter. a grid M. method of L. greatly increase the resolution lichen of this esti cover deposits as well as (oral communication, 1977) Barnhardt measuring as appear to vary study lichen In this do not appear to resolve age differences of has devised and Island. with the maximum thallus diameter. mates (Denton in However, Miller and Andrews (1972) have found much Mean lichen well are Some workers that should cover technique. Lichen succession in the Wasatch Mountains appears to progress in a similar fashion to that in the Elk Mountains of Colorado (Birkeland, 1973). is The lichen about two-thirds to lichen green cover species 6* older species composition three-quarters or deposits approaches more an and half dark brown and black the resolution is not as fine as the measure of younger green species. deposits The apparent limit of half species. Again, however, of the maximum lichen |
