MARYLAND WEATHER SERVICE 223 



and moist humus. Of the fern species Onoclea sensibilis is found 

 in the open moist places, extending into the open meadow areas. 

 Diclcsonia punctilobida is found in the places in the forest where 

 shade is moderate and moisture and humus conditions favorable. 

 In the drier localities Dryopteris marginalis and Dryopteris acros- 

 ti cli aides are common, and in spots still less moist, like the out- 

 cropping rocks, Poly podium vulgare occurs. 



The general conditions of soil moisture and humus content are 

 not quite so favorable as obtain farther from the Pennsylvania line 

 and away from the deeper valleys of the district just discussed. 

 An intermediate series of habitats occurs in the vicinity of the 

 Little Pipe Creek cut through Parr's Eidge. The most notice- 

 able single variation is the difference in the abundance of the 

 Tulip Tree, which here forms about 20% of the forest cover, while 

 it is inconspicuous or scarce in the region to the north of West- 

 minster. 



The Oaks constitute the major portion of the woodland growth 

 and include the Chestnut Oak, the White Oak, the Black Oak, and 

 have as associated trees the Mockernut Hickory, the Butternut, and 

 the ( 'hestnut. The smaller woody plants here include the Dogwood 

 in considerable abundance, Witch Hazel and Spice-bush. A hillside 

 covered with this type of forest is shown in Plate XXII, Fig. 1. 

 The herbaceous plants are not greatly different from those noted on 

 the northern slope, but such plants as Orchis spectabilis there found 

 in some frequency are rare or absent here. Other plants of the deep 

 forest which were observed at this locality are: 



Polygonatum hiflorum 

 A risaema triphyllum 

 Vagnera racemosa 

 I 'vularia perfoliata 

 Sanguinaria canadensis 

 Ilepatica hepatica 

 Aral in nudicaulis 

 Porteranth as trifoliatus 

 I 'rt least rum divaricatum 

 < 'ubelium concolor. 



