176 ENDOSPORE.E. [HEMITRICHIA. 



Hal). On dead wood. Orton, Leicester (B. M. 335, 338) ; Rudloe, 

 Wilts (B. M. 340) ; Batheaston, Somerset (B. M. 341) ; Wanstead, 

 Essex (L:B. M.I 45) ; Hampstead, London (B. M. 1123); Boynton, 

 Yorkshire (B. M. 1126) ; France (K. 123) ; Germany (B. M. 791, 700) ; 

 Italy (B. M. 789) ; Finland (B. M. 788) ; Poland (Strassb. Herb.) ; 

 Iowa (B. M. 830) ; Texas (B. M. 956) ; S. Carolina (B. M. 761). 



2. H. intorta Lister. Plasmoclium watery-white. Total height 1 

 to 1*5 mm. Sporangia turbinate, stipitate, gregarious or scattered, 

 0*3 to 0*7 mm. diam., shining, yellow or olive-yellow; sporangium- 

 wall membranous above, thickened with granular deposits towards 

 the base, papillose on the inner side. Stalk thickened above and 

 below, with two to four broad longitudinal furrows, 0'5 to 0*7 mm. 

 long, 0'15 mm. thick in the middle, glossy, purplish-brown, solid, 

 not filled with spore-like cells. Capillitium a twisted tangle of 

 sparingly branched orange-yellow threads, 4 p diam., marked 

 with four to five more or less distinct, closely set, spiral bands, 

 sometimes connected with longitudinal striae, densely spinulose or 

 nearly smooth. Spores yellow, minutely warted, 9 to 13 ^ diam. 

 Hemiarcyria intorta List., in Journ. Bot. (1891), p. 268. Hemi- 

 arcyria longijila Hex, in Proc. Acad. Nat. Sc. Phil. (1891), p. 396. 



a. genuma : spirals on elaters distinct, usually spinulose ; 

 spores 9 to 10 /x. 



(3. leiotricha : spirals on elaters indistinct, smooth ; spores 

 12 to 13 fji. 



Plate LXIIL, B. a. a. genuma, sporangia, x 20; b. capillitmm and 

 spores, x 600 (England) ; c. /3. leiotricha, sporangium, x 20 ; d. capilli- 

 tium and spores, x 600 (England). 



The var. genuma appeared in considerable abundance near Hitchin 

 in March 1889 and January 1890. It was also gathered near Bir- 

 mingham by Mr. Camm in October 1889, and was described in the 

 Journal of Botany, September 1891. A few months later it was 

 independently recorded in Proceedings of the Academy of Natural 

 Science of Philadelphia by Dr. Rex under the name of H. longijila. 

 Specimens received from Dr. Rex, and Prof. Macbride, of Iowa 

 University, are essentially identical with the English gatherings. 



The var. leiotricha is a form which has been met with on five 

 occasions three times in a larch plantation near Lyme Regis, once 

 in a fir wood at Leighton Buzzard, and on dead leaves at Sande, 

 Norway. In external appearance it resembles var. genuina ; the 

 capillitmm is profuse and of a bright yellow colour. In the Lyme 

 Regis gatherings the threads are almost smooth, with a faint in- 

 dication of spiral markings ; free ends are more numerous in some 

 sporangia than in others. In the Leighton gathering the threads in 

 some cases are nearly smooth, and more or less in the form of long 

 branching elaters of the type of Trichia ; in others they have the true 

 Hemitrichia character, with few free ends. They are marked with 

 distinct spirals (represented PI. LXIIL, B, fig. d). This form would 

 come under the description of H. intorta, except in the size of the 

 spores, which measure 12 to 13 p. Until further material can be 

 met with, it is placed as a variety of H. intorta, with which it is very 

 closely allied. It is interesting as affording another instance of the 

 Trichia and Hemitrichia characters being exhibited in one species, as 



