The pattern of growth of Polytrichum alpestre Hoppe, a common moss in the maritime Antarctic, is described. It may form extensive communities, sometimes growing with another moss, Chorisodontium aciphyllum (Hook. f. & Wils.) Broth. Underlying the basic stability of such communities there is a persistent change in shoot composition from season to season. These changes have been followed both photographically and stratigraphically, since a complete record of past changes exists within the slowly decomposing turf. Considerable instability in the total population of shoots of P. alpestre occurs during the first few years of its establishment but as time proceeds and conditions more favourable to the growth of P. alpestre develop, the mean life expectancy of shoots increases. Variation in spatial density of shoots is discussed in relation to size and weight of the annual increments in P. alpestre. The relationship between weight of the annual increment and the spatial density approximates to the density effect law applied to higher plants, in which yield per unit area is little affected by variation in density
The grateful iteration Dead & Company has taken a page from the Grateful Dead playbook, announcing a free show in San Francisco coming up next Monday, May 23rd. The show will be held at The Fillmore, and tickets go on sale tomorrow, May 19th, at 12 PM Pacific.The band only asks that you “pay it forward” by performing some random act of kindness, and sharing it with the hashtag #DeadandCoSF. The announcement reads “Please share your good deeds and generosity with us, and let the cosmos know how you are paying it forward.” Could this band be any cooler?Perhaps one of the most famous free Grateful Dead performances came in the middle of Haight Street on March 3rd, 1968, when the band set up shop and played a show completely unannounced. When word got out, thousands flocked to the streets and witnessed the Grateful Dead magic in its glory. This image just about says it all:You can find out more information about the free show coming up this Monday, through the band’s website.