Nexv and Little Known West-Himalayan Liverworts. 2 21 
of the compact part of the thallus contain numerous starch grains. 
In the older parts of the thallus these cells are either empty or 
contain some minute grains stained brown with iodine. 
Fig. 4. Aitchisoniella hitnalayensis: a, stoma, x 180 ;b, transverse section of 
thallus near apex, x 40; c, longitudinal section of thallus with sporogonium 
(cal., calyptra), x 40; d, scale, x 180; e, scale showing mucilage cells (chloro- 
plasts not drawn), x 180; /, transverse section of thallus with antheridia 
(Ait.), x 40 ; g, transverse section of thallus with a female receptacle showing 
two grooves with archegonia (F., furrow of receptacle), x 40. 
