48 Rhodora [Marcu 
more acid soils. Divergent measurements obtained on some of the 
above species elsewhere than in New England are indicated by the 
letter o in the appropriate column. The range of some species is 
rather wide, yet even in these cases the optimum usually has char- 
acteristic position. It is striking that in certain cases two species 
of the same genus may diverge widely in optimum soil reaction. 
Finally, reaction-sensitive plants, belonging to other than the 
above two families, which were studied will be listed for complete- 
ness. In Table V are given the oxylophytes; the optimum reaction 
of all these has been found by actual test to be mediacid, although 
a few of them have been observed occasionally in subacid soils as 
well. 
Taste V. Mepracip Som, PLants (OXYLOPHYTES). 
(Observed in northern Vermont and New Hampshire, 1919. ) 
Aspidium Boottii Tuckerman (Dryopteris Boottii Underwood). 
F spinulosum (O. F. Müll.) Swartz (Dryopteris spinulosa 
Kuntze). 
5i E var. intermedium (Muhl.) D. C. Eat. (Dryop- 
teris intermedia (Willd.) A. Gray). 
Lycopodium Selago L. var. appressum Desv. 
» annotinum L. 
H s var. pungens Desv. 
Smilacina trifolia (L.) Desf. (Vagnera trifolia Morong.) 
Clintonia borealis (Ait.) Raf. 
Streptopus amplexifolius (L.) DC. 
roseus Michx. 
Salix Uva-ursi Pursh. 
Arenaria groenlandica (Retz.) Spreng. 
Stellaria borealis Bigel. 
Sarracenia purpurea L. 
Coptis trifolia (L.) Salisb. 
Rubus Chamaemorus L. 
Potentilla tridentata Ait. 
Geum Peckii Pursh (Sieversia Peckii R. Br.). 
Pyrus melanocarpa (Michx.) Willd. (Aronia Britton). 
Cornus canadensis Is. (Chamaepericlymenum canadense Aschers. & 
Graebn.). 
Trientalis americana (Pers.) Pursh. 
Linnaea borealis L. var. americana (Forbes) Rehder. 
In Table VI plants of cireumneutral soils as shown by actual tests, 
are treated similarly; probably all of these are to be classed as cal- 
cicoles. 
