278 



OHIO BIOLOGICAL SURVEY 



and I'loni year to year in tlu' same place. It is iiuleed the rocky ground 

 in wliicli the seeds of many plants fall and spring up ([uickly but wither 

 away for lack of a root when exposed to the scorching sun. None but 

 the cryptogams in the above list can be considered as constant inhab- 

 itants. Hut they are never fountl without the admixture of soiiu' seed 

 plants, wliether of the species listed above or others. 



Most of the waifs here present are stragglers fiom the nearby 

 forest, but two or three are interesting in that they do not occur in tlie 

 forest. A)iibr()sia elatior found but little place in the primaeval vege- 

 tation of the region, since it is dependent on strong illumination, 

 wliieli was denied all of the phmts on the forest floor. It is interesting 

 to find it as a fre(iuent inhabitant of such places, whether as an original 

 native or as an introduced weed. Ili/pi ricuin (IninDrunidii, which 



FiK. r 



A Siiuill J'liiiit of TruiliiiK Arbutus Anions tlie Roots of the i'in 

 Edge of the Cliff. 



reaches its extieme eastern limits in this area, was foiuid in a single 



station in such a lichen formation. It was abundant in 1909, but very 



scantily repi'esented in 1910. 



Following the Cladonia association is a transitional shrub zone 



composed of : 



Vaccinium vacillans Sniildj- rot inidi folia 



Polyroflium staminium Kalmia latifoUa 



Gnylosaccia baccnta Lespedeza rrpens 



Epifiacn repens (fig. 17) Lechea minor 



Onultheria procumhens Hypiiaccdi .s/). (fm-niiiiii' ttifts) 



Mitclif ihi rcpenn 



