5 Morphologie und Teratologie. 



are inserted at the apex of the coroUa tube, and the ovary is 

 turbinate with a minute style and three long, subplumose 

 Stigmata. 



In describing some points in regard to the morphological 

 structure of Claytonia, the following biological types are 

 noticed : 



I. Annual species. 



A. The shoot terminated by an inflorescence (C. linejris, 

 diffusa, dlchotoma). 



B. The apex of the shoot vegetative (C. sihirlca, areni- 

 cola etc.). 



II. Perennial species. 



C. As B, but with a fleshy, horizontal rhizome (C. asari- 

 folla). 



D. As C, but the rhizome is short and slender and bulblets 

 occur in the leaf-axils (C. parvifolia). 



E. Monopodial as those above (from B to D inclusive), 

 but rhizome erect, short and with a large root (C. 

 virginica, megarrliiza etc. i. 



F. Monopodial, with stolons above-ground and slender 

 root (C. sannentosa). 



G. Not monopodial, with filiform roots and stolons under 

 ground often terminated by bulblets (C. Chamissonis). 



These types are described in detail, and the germination 

 of C. virginica and megarrhiza shows several points of 

 interest. In the former there is but one cotyledon of approxi- 

 mately the same shape as the succeeding leaves and the pri- 

 mary root is at first quite long and slender. The slender apex 

 dies off during the first year while the base persists and develops 

 into a roundish, tuberous organ. There is no hypocotyl. In 

 C. megarrhiza both cotyledons are developed and the primary 

 root persists in its entire length and increases rapidly in 

 thickness together with the short hypocotyl. 



The internal structure of the vegetative organs is, also, 

 discussed, and characteristic of the genus is, for instance, the 

 lack of stereome and collenchyma, the structure of the stomata, 

 which have one to two pairs of parallel subsidiary cells in 

 contrast to Montia), the lack of trichomes, of rescrvoirs etc. 

 The plates illustrate various stages of some of the species 

 besides anatomical sections. Theo. Hohn. 



Lyon, Florence, The Spore Coats o\ Selaginelta. (Botanical 

 Gazette. Vol. XL. 1905. p. 285—295. Pls. 10—11.) 

 Two types of development of the megaspore coats are 

 described. In the Selaginelta rupestris type there is never 

 any appearance of an organic Separation of the two membranes 

 from the protoplast of the spore or from each other. The 

 other and more common type is found in 6". Emmeliana, S. 

 apus, S. Mertensii, etc. In this type, sections of young me<4a- 



