Pteridium aquilinum (L.) Kuhn
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Authority
Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.
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Family
Dennstaedtiaceae
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Scientific Name
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Discussion
The typical variety of this species does not occur in Puerto Rico. The Puerto Rican varieties can usually be distinguished as follows:
a. Free lobes absent from the rhachis, costae, and costules; midvein on lower surface ofthe ultimate segments usually glabrous. ..
la. var, caudatum.
a. Free lobes present on the rhachis, costae, and costules, these altemating with normal divisions; midvein on lower surface of the ultimate segments usually dark-pubescent
lb, var, arachnoideum.