-85- 



mm. wide, somewhat narrowed toward the base and attached by an almost 

 longitudinal line of insertion, margin subentire or slightly crenulate or denticulate 

 from projecting cells, rarely with a larger blunt tooth near end of keel, apex long- 

 acuminate, ending in a row of two or three cells; lobule strongly inflated at base 

 and along keel, broadly ovate, 0.15 mm. long, o.i mm. wide, keel strongly arched, 

 slightly roughened in outer part from projecting cells, free margin plane and 

 appressed to lobe, passing beyond apex by a lunulate sinus to end of keel, apical 

 tooth strongly curved; cells of lobe somewhat convex, their walls slightly but 

 uniformly thickened, averaging 19 X 14 m; ocelli commonly two, one at the base 

 of the lobe, the other at about the middle, indistinct; underleaves distant, basal 

 portion quadrate or rectangular, 0.03 mm. long, marginal cells six, divisions 

 obliquely to widely spreading (up to 0.07 mm.), each consisting of two or three 

 cells in a single row, rarely two cells wide at base: inflorescence dioicous: 9 

 inflorescence borne on a very short branch innovating on one side with a simple 

 and sterile innovation'; bracts obliquely spreading, unequally bifid, the lobe ovate, 

 0.35 mm. long, 0.15 mm. wide, long-acuminate, the margin coarsely and irregu- 

 larly dentate or spinulose-ciliate, usually with from four to seven teeth, lobule 

 irregular in shape, 0.25 mm. long, 0.08 mm. wide, acute to acuminate, margin as 

 in lobe, but usually with fewer teeth (mostly one to five) ; bracteole connate on 

 one side, ovate, 0.3 mm. long, 0.15 mm. wide, bifid about one-third with erect, 

 subacuminate lobes and narrow sinus, margin as in bracts, usually with from five 

 to twelve teeth in all: perianth broadly obovoid, 0.4 mm. long, 0.3 mm. wide, 

 gradually narrowed toward the base, truncate above and with a short beak, terete 

 below, sharply five-keeled in upper part, the keels projecting outward as subacute, 

 slightly dentate horns; $ inflorescence unknown." 



Explanation of Plate III 



1. Part of plant, antical view X 63 



2. Leaf, antical view showing the two ocelli {See Note "A" below) X 287 



3. Cells from middle of lobe X 520 



4. Apex of lobule showing unicellular papilla {See Note "B" below) X 520 



5. Leaf, lobule and underleaf, postical view X 287 



6. Underleaf X 520 



Note A. "Ocelli are not usually found in Drepanolejeunea. They are 

 never conspicuous and their number (in the vegetative leaves at least) never 

 exceeds two. Even in species in which they are normally present, many of the 

 leaves, especially those which are poorly developed, fail to show them. The ocelli 

 in most cases are no larger than the neighboring cells and usually retain their 

 angular form even when their contents become lifeless. They are distinguished by 

 the granular or fatty bodies which they contain and do not usually become hyaline 

 and empty as in many other Lejeuneae. Sometimes the addition of potash solu- 

 tion brings them out more clearly. With regard to the uses of these ocelli prac- 

 tically nothing is known, although it is probable that they sometimes take part 

 in the formation of the water sack." 



