. The Canadian field-naturalist. . Figure 6. The major drainage through the north part of the Swamp, showing the erratic course of the stream and the unstable substrate adjacent to it. Several crustose lichens occurred on smooth, rounded boulders in the stream bed in the south-east part of the Swamp. These lichens, Rhizocarpon disporum (Naeg. ex Hepp) Miill. Arg., Acarospora veronensis Mass., Lecanora melanophthalma (Ram.) Ram., Physcia caesia (Hoffm.) Hampe, Dimelaena oreina (Ach.) Norm., and Xanthoria elegans (Link) , all grew at a level of more than 1 foot above maximum observed high-
. The Canadian field-naturalist. . Figure 6. The major drainage through the north part of the Swamp, showing the erratic course of the stream and the unstable substrate adjacent to it. Several crustose lichens occurred on smooth, rounded boulders in the stream bed in the south-east part of the Swamp. These lichens, Rhizocarpon disporum (Naeg. ex Hepp) Miill. Arg., Acarospora veronensis Mass., Lecanora melanophthalma (Ram.) Ram., Physcia caesia (Hoffm.) Hampe, Dimelaena oreina (Ach.) Norm., and Xanthoria elegans (Link) , all grew at a level of more than 1 foot above maximum observed high-water. (3) Banks. The bank habitat occurs in the south and south-east parts of the Swamp and at the Swamp-forest boundary on the south and west. Several inches of fibrous, organic rich soil of good drainage and good water-holding capacity, lying on the substrate above the seepage and flowing water, supports moist-habitat and mesic species of mosses, herbs, and shrubs. The terricolous lichens, Peltigera aphthosa (L.) Willd., Cladina mitis (Sandst.) Hale & , Cladonia cariosa (Ach.) Spreng., C. cenotea (Ach.) Schaer., C. chlorophaea (Florke ex Somm.) Spreng, sensu lato, C. pyxidata (L.) Hoffm., Ce- traria ericetorum Opiz, C. nivalis (L.) Ach., and Lecanora epibryon (Ach.) Ach.; and the rotten- wood lichens, Cladonia coniocraea (Florke) Spreng., C. fimbriata (L.) Fr., C. gracilis var. dilatata (Hoffm.) Schaer., C. pocillum (Ach.) , Hypogymnia austerodes (Nyl.) Ras., Par me Ha sulcata Tayl., and Parmeliopsis ambigua (Wulf.) Nyl. were found only in the bank habitat. A series of lignicolous lichens were found on the dry, deeply-weathered roots of a windthrownP/cea glauca (Moench) Voss in the bank habitat: Lecidea glomerulosa (DC.) Steud., Lecanora coilocarpa (Ach.) Nyl., L. varia (Ehrh.) Ach., Candelaria concolor (Dicks.) , Cetraria pinastri (Scop.) S. Gray, Parmelia elegantula (Zahlbr.) Szat., P. exasperatula Nyl., Parmeliopsis hyperopia (Ach.) Am., Letharia
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