CHAEA DENUDATA. 43 



The plant from Norfolk figured by H. & J. Gr. in 

 'Journ. Bot.' XXIV, t. 263, 1886, as C . papillosa was 

 subsequently regarded as a hybrid between C. contraria 

 and C. hispida, see Groves Exsicc. 42 and Gr. &B.-W. 33.] 



8 a. Chara muscosa Groves & Bullock-Webster. 



Journ. Bot. LXII, p. 33, t. 570 (1924). Exsicc. Gr. & B.-W. 13, 34. 



(Plate XXXV.) 



Monoecious. Stem very short (c. 5-7 cm.), about 250- 

 375 [i. in diameter, much branched ; internodes not much 

 exceeding the branchlets. Cortex regular, the primary 

 series very much more prominent than the secondary, 

 extremities of secondary cells meeting squarely ; spine- 

 cells normally solitary spreading elongated, sometimes 

 twice as long as the diameter of the stem, usually 

 tapering from a somewhat broad base, obtuse to sub- 

 acute. Whorls of 6-7 branchlets. Stipulodes of both 

 series well developed unequal, sometimes as long as the 

 lowest branchlet-node, similar in shape to the spine- 

 cells. Branchlets incurved, of 4-5 short segments, the 

 ultimate segment very short, often exceeded by the 

 uppermost bract-cells. Bract-cells normally 5, usually 

 all developed, very variable in length, the anterior 

 shorter than the fruit, obtuse to subacute ; bracteoles 

 long, slender, much exceeding the bract-cells. Oogonia 

 and antheridia solitary, produced at the first and second 

 branchlet-nodes. Oogonium c. 700-800 [i. long (excl. 

 cor.), 450-500 (x broad ; spiral-cells showing about 14-17 

 convolutions ; coronula very large, c. 175-200 y. high, 

 -^ 450 (X broad, the cells spreading from their base. 

 Oospore ellipsoid or ellipsoid-obovoid, c. 615-665 pi long, 

 340-400 [x broad, black, showing 13-16 fine low ridges, 

 terminating in inconspicuous, claws ; outer tnembrane 

 brittle, semi-opaque dark brown. Antheridium c. 425 y. 

 in diameter. 



Habitat and Distribution. — Ireland: Sandy soil in 



