140 Morphologie und Teratologie. 



hairs. The rhizoids develope very rapidly and are o! two kinds. 

 The majority are narrow and thick-walled, springing from the whole 

 of the under surface and coUected into a bündle along the middle 

 of the thallus. The others are wider possessing thin colourless walls 

 and are confined to the median portion, growing directly downwards 

 and frequently becoming branched. 



The male receptacle is oval and sessile on the upper surface of 

 the thallus: the growing point is not used up in its developement. 

 In structure and developement it closely resembles that of Reboulia 

 and the developement of the antheridium is of the usual Marchan- 

 tiaceous type; a cell projects, becomes divided by three or four 

 transverse walls and then each cell is divided into four by two 

 intersecting veriical walls. The mature antheridium is ovoid, having 

 a Short stalk and tapering above to a pointed beak; there is a well- 

 marked explosive discharge of antherozoids. The archegonial recep- 

 tacie is developed at the end of a brauch and becomes sunk in a 

 depression which opens at the anterior margin of the thallus. The 

 archegonium has a very long neck, the neck cells being arranged 

 in six rows which are quite straight. The first division of the tgg 

 cell is transverse and is followed by a transverse division in the 

 Upper cell. The lower cell gives rise to the foot, the superficial cells 

 of which project as rounded papillae, while the two upper cells form 

 the capsule and seta. Each archegonial cavity often contains only 

 one ripe sporogonium but two may be present. The capsule wall 

 consists of a Single layer of large oblong cells with the outer and 

 inner walls uniformly thickened, the radial walls bearing numerous 

 obliquely running fibres. 



The author concludes that the affinities of Monoclea are with 

 the Marchantiaceae rather than with i\\& Jiingermanniaceae, especially 

 on account of the presence of two kinds of rhizoids, the structure 

 and developement of the male receptacle, the developement of the 

 antheridium and the presence of six rows of neck cells in the arche- 

 gonium. M. Wilson (Glasgow). 



Geremicca, M., Sopra un caso teratologico del pistillo di 

 Zea Mays. (Boll. Soc. Nat. Napoli. Ser. 1. Vol. XVil. 1903. 

 p. 242-244.) 



II s'agit d'un dpi de Z. Mays dont les parties moyenne et supd- 

 rieure ont les fleurs avortees et steriles et la partie infdrieure les fleurs 

 remplacdes par des phyllömes entourds ä leur base par des glumelles 

 et termines par le long style caractdristiqne de cette Graminee, ce 

 qui montre que le phyllöme reprdsente la partie ovarienne du carpide. 

 C'est une preuve que la region ovarienne du pistil est constitut^e par 

 la gaine de la feuille carpellaire. R. Pampanini. 



GOEBEL, K., Klei nere Mitteilungen. (Flora. Bd. XCV. 1905. 

 p. 232.) 



1. Eine merkwürdige Form von Campaniila rotiindifolia. 



Diese Pflanze, im Freien gefunden, zeigt Übereinstimmung mit der 

 durch Kultur bei geminderter Lichtintensität erhaltenen Rundblattform. 

 Merkwürdig ist, dass sie, trotzdem sie eigentlich nicht aus dem 

 Jugendstadium herauskommt, eine Blüte hervorbringt und zwar 

 trägt diese der Hauptspross. Goebel erklärt es dadurch, dass die 

 Lichtwirkung nur hinreichte, um eine Blüte und keine Infloreszenz 

 hervorzubringen. 



