1921 ] Third Report on Floral Areas 215 



II. Generally distributed, except in Cape Cod. 



Equisetum sylvaticum, 



viir. pauciramosum 7 Lycopodium clavatum 



Lycopodium clavatum, var. megastachyon 



Species with this range (e.g., Cystopteris fragUis) occurred in (he 

 families previously reported upon, hut were then included among 

 the generally distributed species. It now seems to us, however, 

 desirable to segregate them, since the absence of any plant from Cape 

 Cod is likely to be significant of its preferences as to soil and habitat 

 conditions. 



The species here included are inhabitants of moist or dry wood- 

 lands or rarely meadows, in comparatively rich soils. Their absence 

 from Cape Cod is doubtless due to lack of suitable habitats there. 



III. Neither the upperSt. John nor Cape Cod; rather general 



ELSEWHERE. 



Botrychium simplex Botrychium ternatum, 



var. intermedium 

 Equisetum liyemale, var. affine 



This group corresponds closely to the "Rich Soils" group of the 

 last report. Botrychium simplex is not known to us from any 

 point in Maine north of about the 45th parallel of latitude, exeept 

 for a single outlying station at Bridgewater (Kate Furbish). B. 

 ternatum, var. intermedium reaches slightly further north in central 

 Maine and has similar outlying stations at Mars Hill and Limestone. 

 These isolated occurrences are probably to be accounted for by tin; 

 existence in eastern Aroostook County of a large area characterized 

 by a hardwood forest of a distinctly southern type. 8 Equisetum 



' Including, for our purposes, f. mulHramosum. The stations for typical var. 

 IHiHcirumosum arc all within the range of group HI; but they are few and scattered 

 and we doubt if their distribution indicates anything but accidents of collection. 



8 See Cioodale in 6th Rep. Maine Board of Agric. 370ff. (1861). Prof. Goodale 

 was struck by the contrast between the vegetation of this area and that of the upper 

 St. John, from which he had just come. He had no opportunity to ascertain its 

 extent. Prof. Fernald, to whom we are indebted for the reference to Goodale's work, 

 informs us that it runs from the Aroostook Valley on the north to that of the Matta- 

 wamkeag on the south, and west to about the 69th parallel of longitude. On the 

 southwest a narrow arm connects it with the hardwood forest area of central Maine, 

 forming an avenue of emigration for woodland species. 



