[May, 



by Wright in New Mexico (No. 908). It is a slender diffuse 

 plant, with rather long leaves 



of 5-6 articulations, including 



The 



;t.p- 



ules and bracts are very slen- 

 der ; the bracts are unilateral, 

 shorter than the sporangium, 

 the anterior rather longer than 

 the lateral. The coronula of 

 sporangium consists of 

 cells with elongated diverg- 

 fig. 1.— Variety Braunii tenera. i n g tips, intermediate in aspect 



between var. Braunii and var. Oahucnsis A. Br. The sporangia 

 and antheridia are usually duplicated on each of the two lower 

 nodes. The terminal segment consists of three slender elongated 

 cells forming a tuft. The nucleus is oval with about seven sharp 

 angles, 420 to 460 ,«• long and about 250 /*, broad. In the adjoin- 

 ing cut 1 represents the anterior aspect of a node with two spo- 

 rangia but with the antheridia removed, as at 3. 2 is a terminal 

 node — all magnified' forty diameters. 



11. Forma microcarpa, microptila, unilateralia, laxior (var. 

 Braunii geuuiua). This form has been collected near St. Louis by 

 ~ Dr. Engelmann (to whose kindness I 

 w\ //;' J am indebted for specimens). Plants 



diffuse, leaves longer than the inter- 

 nodes, 4-5 articulations, of which the 

 V lowest or the two lowest are fertile ; 

 V*~— ~^TWV\\ VVJ stipules rather stout but short ; bracts 

 stout, unilateral, much shorter than 

 Coronula of five 



v •< in ^ [{ 



cells 



broadly oval, 475 to 500 /*. long, with 



about six ribs, which are blunt and 



not prominent. The accompanying 



figure, magnified forty times, repre- 



aumigeHuina.stnXs the anterior aspect of a node of 



sporangia, one antheridium, in situ (outlined) and 



only the anterior bracts are shown, the lateral are 



one removed 



about the same length. 



in. Forma meiocarpa, microptila, verticillata, 



;longata. 



- 



