ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 561 



believes that it is not present in the spermatozoid. The number of 

 chromosomes is probably eight. 7. The archegonial receptacle is smallest 

 in P. ZoHingeri, largest in P. radiculosa. In the latter species the 

 archegonium shows a limited apical growth due to the activity of the 

 cover-cells. 8. The embryo of Pallavicinia is much like that of other 

 Anacrogynae, and is perhaps most like that of Aneura in the development 

 of a very large haustorial organ, or suspensor. In this respect the 

 three Javan species seem to differ a good deal from P. decipiens and from 

 Morkia. P. ZoHingeri is nearest to Morkia in the form of the capsule 

 and the larger foot. 9. In the structure of the capsule the three species 

 are alike. The capsule has a more or less conspicuous terminal beak or 

 pad, which remains intact, so that the four valves of the open sporo- 

 goniuni remain attached to each other at the apex, dehiscence taking 

 place by four longitudinal slits. The beak is best developed in P. radi- 

 cidosa, in which the capsule is more elongated. The much shorter and 

 relatively broader capsule of P. ZoHingeri recalls Morkia or Galycidaria. 

 P. ZoHingeri also resembles the latter in the tuberculate spores. In 

 P. radiculosa and P. Levieri the spores are reticulately marked. 



In conclusion, the authors regard P. ZoHingeri as approaching 

 Morkia in respect of structure, and are on the whole inclined to retain 

 the generic name Mittenia for the dendroid species of Pallavicinia, leav- 

 ing the section Eupallavicinia to be transferred to Blgttia. They are 

 also of opinion that the production of reproductive organs upon special 

 branches, which appears to be the only constant difference between the 

 Aneuraceas and Blyttiaceas, seems hardly of sufficient importance to 

 warrant the establishment of two separate families. 



Fegatella without Air-chambers.* — Annie C. Maybrook publishes 

 a note on a colony of Fegatella found in a moist little cavern in a high 

 hedge-bank, which showed air-chambers dwindling to nothing. The 

 absence of air-chambers is presumed to be due to the combined effect of 

 darkness and moisture. Thalli growing in decreasing intensities of 

 light revealed a gradual decrease in the number of air-chambers per 

 unit of surface area, and in the size of those air-chambers. The final 

 disappearance, however, seems to be dependent on the factor of moisture, 

 for only in those forms showing marked adaptations to a moist habitat 

 were the air-chambers .totally lacking. Figures of the thalline structure 

 and the reduced chambers are given. Suppression of the air-chambers 

 in Fegatella does not appear to have been noticed previously. 



Xerophytic Adaptations of Bryophytes.f— iW. Watson has for 

 several years studied the xerophytic adaptations of bryophytes in re- 

 lation to habitat, and publishes the results of his observations. He 

 classifies the structures concerned under the following headings :— 

 I. Protective arrangements in the sporogonium : (1) Immersion of 

 capsule ; (2) length of seta ; (3) curvature of seta ; (4) papillosity ; 

 (5) bell-shaped calyptra ; (6) hairy calyptra, etc. ; (7) position of 

 stomata ; (8) plication of capsule ; (9) fleshy or bulbous involucre. 



* New Phytologist, xiii. (1914) pp. 243-9 (figs.). 



t New Phytologist, xiii. (1914) pp. 149-69, 181-9 (figs.). 



Dec. 16th, 1914 2 p 



