2 FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



CYATHEACE.E. 



Sori dorsal, more or less globose, situated usually at or near the 

 forking of a vein, and consisting of an indusium enclosing from i-many 

 sporangia rising from a central projecting axis. 



HEMITELIA. 



Sori globose, each solitary on a veinlet. Indusium an ovate, 

 concave, torn scale, situated at the lower side of the base. 



[Hemitelia Hartii Baker. Jour. Bot. 1886:243. 



This species is reported as having been collected by Dr. Gaumer, 

 on the island of Cozumel in 1885. I have seen no specimen of it 

 in Dr. Gaumer's personal herbarium, nor have I met with it either 

 personally, or in collections from the peninsula or islands.] 



P O L Y P O D I A C E M . 



Sporangia raised upon a stalk and collected in dots, lines, or 

 variously shaped clusters, their surfaces cellular-reticulated, their 

 margin an incomplete many-jointed ring which by straightening out 

 at maturity ruptures the sporangium horizontally, allowing the dis- 

 charge of the spores. Sori often indusiate. 



ASPIDIE.E. 



Sori round, borne on the back or rarely at the apex of the veins. 

 Indusium flat or flattish, scarious, orbicular and peltate at the center, 

 covering the sporangia. Spores phaseoloid, more or less invested 

 with a thin, transparent, free margined membrane. 



Dryopteris patens (Sw.) Ktze. 



Aspidium patens Sw., Nephrodium patens Desv. 



Fronds pinnatisect, segments lanceolate-acuminate, pinnatifid 



beyond or to the middle, sessile, the lowest somewhat decrescent; 



lobes cuneate or often falcate, 

 bluntish, entire, the upper basal 

 one enlarged and pinnatifid; veins 

 simple, free, or the basal ones 

 meeting at the sinus between the 

 segments. Sori at the ends of 

 the free veinlets ; indusium 

 superior, small, plane and circu- 

 lar with an erose margin, the 

 upper surface aciculate-hairy ; 



(Lr f8 ^^(:)W3 sporangia broadly anastomose- 



rT* <3yjftln& 1 J^S I \V//^/V 1 1 1 * 



ridged ; spores phaseoloid, their 

 surfaces marked by many broad, 

 flat anastomosing ridges. 

 Yucatec name: CULANTRILLO BLANCO, "White Maiden-hair." It 



is said to be used with marvelous results in domestic practice as an 



anti-purgative, and remedy for post-partum colic. 



