Showing papers on "Undergrowth published in 1969"

An Ecologic Study of Epiphytic Bryophytes and Lichens on Pseudotsuga menziesii on the Olympic Peninsula, Washington. I. A Description of the Vegetation

Abstract: Six epiphytic vegetational unions occur on northeast and southwest exposures of Pseudotsuga menziesii in mature forests of the Olympic Peninsula, Washington. The Hypnum circinale-Dicranum fuscescens-Scapania bolanderi Union and the Hypnum circinale-Dicranum fuscescens-Lepraria membranacea Union both occur in very mesic habitats. The Hypnum circinale-Lepraria mem- branacea Union and the Hypnum circinale-Lepraria membranacea-Sphaerophorus globosus Union occur in habitats of intermediate moisture. The lichen-dominated unions of Platismatia glauca-Parmeliopsis hyperopta-Lepraria membranacea and Alectoria sarmentosa-Parmeliopsis hyperopta-Ochrolechia tartarea-Myco- blastus sanguinarius both occur in relatively xeric habitats. The relationships between epiphytic vegetation and surrounding vascular vegetation are general; bryophyte-dominated unions occur in mesic habitats where the undergrowth is characteristic of the Polystichum munitum Union,

Studies on the flora and vegetation of the Ormos Archangelou in Rhodos Island

Abstract: Ormos Archangelou or Tsambica Bay is located at about 28 km southwest of the town Rhodos. There can be distinguished two types of Vegetation: a. the evergreen sclerophyll shrubby formation of “Macchia” with its typical Association Erica verticillata-Arbutus unedo, and b. the xeromorphous low shrubby formation of “Phrygana” with its corresponding Association Poterium spinosum-Coridothymus capitatus. The first type of Vegetation, which occupies a small part of the area, can be considered as an anthropogeneous undergrowth in the shrubby degradation stage of the forests which covered Rhodos Island in older times. The many solitary old trees of Pinus brutia, Cupressus sempervirens f. horizontalis, Quercus aegilops, Quercus coccifera, and others, which are growing on open areas of the island, may be considered as most characteristic indications of this hypothesis. Sociological data concerning this type of Vegetation are given in Tables I–II. The second type of Vegetation is the most xeromorphic plant formation of the Aegean Island, consisting mainly of low xeromorphic shrubs, 0.50–0.70 m high. This is physiognomically the most distinctive vegetation type of calcareous rocky lands of the Aegean Islands. It covers most of the area and extends particularly on slippery rocky slopes, on very dry hills, on soils composed mainly of pebbles and cobbles, along the borders of Macchia Vegetation, and to a great extent in large patches among xerophilous Macchia. Sociological data concerning this type of Vegetation are given in Table III.