_ —123— 



has been reported from Connecticut and Vir- 

 ginia. 



184. Polystichum aculeatum (L.) Prickly 



Shield Fern. Common; in rocky woods and 

 slopes. California and Oregon to Washington ; 

 also nearly throughout the world in temperate 

 and tropical regions. Extremely variable in the 

 cutting of the fronds and thus giving rise to 

 many varieties. More than forty have been 

 catalogued. — Aspidium aculeatum Sw. ; Dry- 

 opt er is acute at a Kuntze. 



The American forms annulare Presl; 

 California D. C. Eaton, and lobatum Ait. 

 are likely to be found with the type. 



185. Polystichum aculeatum Braunii (Spenner) 



Not uncommon ; in moist shaded woods. Maine, 

 New Hampshire, Pennsylvania, Michigan and 

 Washington northward ; also in Europe, Asia 

 and the Hawaiian Islands. — Aspidium aculea- 

 tum Braunii (Spenner) ; Dryopteris aculeata 

 Kuntze. Polystichum Braunii (Spenner) 



186. Polystichum aculeatum scopulinum (D. C. 



Eaton. ) Not uncommon ; in rocky places. Cali- 

 fornia and Arizona northward to Washington 

 and Idaho and in Quebec. — Aspidium aculea- 

 tum scopulinum D. C. Eaton. ; Polystichum 

 scopulinum (D. C. Eaton.) 



187. Polystichum Lemmoni Underw. Rare ; North- 



ern California to Washington. Reported by 

 D. C. Eaton to be identical with Polystichum 

 mohriodes Bory from South America and until 

 recently listed under this name. 



188. Polystichum lonchitis (L.) Holly Fern. 



Common ; in rocky woods. Nova Scotia, Wis- 



