r. 37 



quadrate or pentagonal; spore-wall smooth and 

 becoming yellow-brown . 



Length 6-10 p.; breadth 6'2-9'5//,; breadth of 

 isthmus 3-4*7 /x ; thickness 4-5 *2/^; length of zygosp. 

 15-19 p.; breadth 11 -5-1 3 ft. 



ENGLAND. Brothers' Water, Helvellyn, and Esth- 

 waite Water, Westmoreland ! Kiccall Common, E. 

 Yorks ! Thnrsley Common, Surrey (with zygospores) ! 

 Xew Forest, Hants ! Crowan, Cornwall ! 



WALES. Capel Curig!, Llyn Idwal!, and Yr Orsedd !, 

 Carnarvonshire. 



SCOTLAND. Sutherland !, Ross, Inverness !, Banff, 

 Aberdeen, Kincardine, Forfar !, Perth !, Stirling, 

 Argyll ! (Roy $ Bissett). Outer Hebrides ! Shetlands ! 



IRELAND. Donegal ! Mayo ! G-alway ! Kerry ! 

 Dublin and Wicklow (ArrJit'i'). 



Geoyr. Disti'ilti.fioit.- -France. Germany. Sweden. 

 Bornholm. Faeroes. Japan. Ceylon (var.). Australia. 

 jSTew Zealand (var.). Madagascar. United States. 

 West Indies. Brazil. Australia. 



C. Regnesi is not an uncommon species in the boggy margins 

 of pools and lakes, both in lowland and upland areas, but 

 owing to its minute size it is easily overlooked. We find the 

 normal type of semicell to be a six-toothed one, with the 

 margin concave between each pair of teeth and widely retuse 

 in the middle of the apex. The commonest departures from 

 this type are the eight-toothed forms, in which the two lateral 

 teetli are replaced by three equidistant ones, or the upper 

 lateral tooth is replaced by two situated close together. In the 

 latter form the semicells appear to possess emargmate upper 

 angles. Occasionally the inferior angles are slightly emar- 

 gmate, and this causes a conspicuous alteration in the form of 

 the sinus. The vertical view is typically elliptic, but some- 

 times there is a slight indication of a central protuberance. 



Sometimes immense quantities of C. Regnesi may be obtained 

 from among the leaves of the submerged species of Sphagnum 

 and Utricularia minor. Such multitudes have resulted from 

 active cell-division under favourable circumstances, and irre- 

 gularities are by no means infrequent. It often happens that 

 a second division commences before the new semicells result- 

 ing from the first division have attained their normal size 

 and characteristics. This may be continued until several 



