102 Henderson — Comparative Study of Pyrolaceae and 



consist of a thin cellular coat with an endosperm composed of 

 a few large cells. The embryo has no form, but consists of 

 several cells. 



In the genus Pyrola, the capsule is five-lobed, splitting from 

 the base upward. The valves are cobwebby on the edges, a 

 distinction from the genus Chimaphila. The seeds in P. rotundi- 

 folia (Fig. io) and P. elliptica are similar to those of Chimaphila. 



In Moneses uniflora, the capsule is five-lobed, splitting from 

 the base upward. The valves are smooth on the edges. 



In Monotropa hypopitys, the capsules are oval, 5-4-celled, 

 loculicidal. The seeds have a thin loose cellular covering; 

 the endosperm consists of a very few large cells — much fewer 

 and larger than in Pyrola; and the embryo itself is reduced to 

 nine cells according to Koch (43), and five according to Solms- 

 Laubach (74). 



In Monotropa uniflora, the capsule is ovoid, dehiscence as in 

 M . hypopitys. The seeds are similar to those of M . hypopitys 

 in the number of endosperm cells, but appear to be even more 

 reduced in the number of cells in the embryo, the writer's mate- 

 rial showing only two. 



In Sarcodes, the capsule is spheroidal, 9-21 mm. broad, with 

 circumscissile dehiscence, the line of dehiscence 1— 1.5 mm. 

 below the base of the style. Oliver has described and figured 

 the seeds of this. In regard to the amount of endosperm and 

 number of cells in the embryo he states that it is very similar 

 to that of M. hypopitys. 



In Pterospora, the capsule is five-lobed, five-celled, loculicidal, 

 the valves cohering with the columella. The seeds are very 

 numerous, ovoid, and are broadly winged at the apex (Drude 

 (12), p. 10, Fig. 6-K). 



In Pleuricospora, the capsule is ovoid, one-celled. 



In Schweinitzia, the capsule is ovoid, five-celled, seeds nu- 

 merous. 



In Allotropa, the capsule is "spheroidal, 4-5 mm. broad" (72). 

 In seeds examined by the writer, the endosperm shows the same 

 number of cells as in Monotropa. 



In Newberrya, the capsule is short, usually ovoid. The writer 

 had no ripe capsules, but found the ovary five-celled, so concludes 

 that the capsule is five-celled also. 



