11 



spike I, very nearly sessile, 4 cm. long, 4 mm. thick : perigynia 

 a little inflated, 5 mm. long, narrowly ovoid, strongly several- 

 ribbed on both sides, narrowed into a short beak, with 2 subu- 

 late nearly erect teeth about i mm. long ; scales pale green, 

 3-nerved, a little shorter than the perigynia, ovate, ciliate-mar- 

 gined, tipped with an awn about 2 mm. long. 



In Sphagmtin, Salt Hill Marsh, Content Road to Cinchona, 

 Jamaica, L. M. Undettvood, January 29, 1903 {no. 138). Re- 

 lated to C. Jiystricina Muhl., but very much larger and broader- 

 leaved, the perigynia less inflated, their beak shorter and its 

 teeth longer. In Urban, Symb. Ant. 2: 159, Mr. C. B. Clarke 

 records the occurrence of C. hystricina at Salt Hill, Jamaica ; I 

 have not seen the specimen that he cites (Herb. Bot. Dept. Jam. 

 2081), but I suppose it represents the species here described, 

 which is certainly distinct from the widely distributed plant of 

 eastern North America. N. L. Britton. 



Twin Pine Embrvos. — Apart from polyembryony resulting 

 from adventitious buds on the nu- 

 cellus, as exhibited in Citrus and a 

 few other genera, it would seem 

 probable that a plant like the pine, 

 which produces regularly several 

 archegonia in its prothallus, would 

 more often have several embryos in 

 the same seed than would plants 

 which produce normally only one 

 embryo-sac in each ovule. But 

 apparently twin or triplet embryos 

 are very rare in the pine ; my 

 classes handle hundreds of pine 



seeds and seedlings each term, yet entirely emerged from endosperm ; /', 

 ,, , . , r 1-^1 larger embryo, with five cotyledons; <•, 



the twin embryos ngured m the ac- *',, / • , , 1 a 



■' ° smaller embryo, witli three long and 



companying drawings are the only two short cotyledons. 



ones I have happened to see. It 



may be an instance of " having eyes and seeing not " ; it so, will 



some one kindly enlighten me? Ida Clendenin. 



Brooklyn, N. Y., 

 December, 27, 1904. 



Twin Embryos of Pine 

 a. Embryos before cotyledons had 



