T. Holm — Erigenia bulbosa. 71 



projections from the epidermis, which is, here, distinctly thick- 

 walled and covered by a wrinkled cuticle. There are four 

 groups of collenchyma, one in each angle, corresponding to 

 four mestome-bundles and four large oil-ducts, located in the 

 bark, between the collenchyma and the mestome-bundles. The 

 cortical parenchyma is somewhat open and consists only of 

 about four or five layers, bordering on a thin-walled but solid 

 pith. None of the smaller ducts with four special cells were 

 observed in the peduncle, although we had expected to find 

 such in the leptome, inasmuch as they were observed in the 

 main stem. 



In regard to the anatomical structure of the fruit, we 

 observed that the carpophore is developed as a thick coating 

 on the concave, ventral face of each mericarp and adnate to 

 these. Thirty-eight oil ducts were noticed in each mericarp : 

 twelve on the commisural side, one outside each of the five 

 mestome-bundles and from five to six in the intervals between 

 these. The statement by Coulter and Rose that the number 

 of oil-ducts in the mericarp of Erigenia is only u one to three in 

 the intervals and nine to eleven on the commisural side," is not 

 correct ; the same is also the case with the description of the 

 ducts as being developed in u the inner epidermal layer itself." 

 They are, according to our observations, developed in the 

 mesophyll, but their location can only be ascertained by exam- 

 ining mericarps, which are not fully matured. We might 

 furthermore, state that the mericarps are not glabrous, but 

 hairy from numerous, short, unicellular, pointed hairs, which 

 are readily seen to cover the entire dorsal face of these. 



Brookland, D. C, May, 1900. 



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