158 ENDOSPOEB^. [bNTERIUIUM. 



(1845), p. 67. DictydicBthaliwm applanatum Rost., in Puckel, 

 Symb. Myc, Nachtr. 2, p. 69. Reticularia entoxantha Berk., in 

 Hook., Journ. Bot. (1851), p. 201. Clathroptychium Berkekyi 

 Mass., Mon., p. 53. 



Plate LXXYI., B. — a. part of an Kthalium seen from above, x 20 ; 

 h. tubular sporangia from an sethalium ; in two of tbem tbe spores are 

 dispersed and the caps and threads of the sporangium-walls are left free, 

 X 20 ; c. sporangia from a stouter sethalium, x. 20 ; d. cap and threads of 

 sporangium-wall, x 50 ; e. hypothallus, areolated with the bases of the 

 sporangia, x 50 ; /. spores and portion of a thread, x 280 ; g. spores 

 and portion of thread from Eethalium drawn at c. x 280' (England) ; 

 h. spore and thread from a stout sethalium, x 280 (Sikkim, K. 1669) ; 

 i. spore, x 600 (England) ; k. spore from type of Glatliroptychivm 

 Berkeleyi Mass., x 600. 



The spores are dispersed by the threads giving way at the base 

 and the sporangia separating in tufts from the persistent shining 

 hypothallus. American specimens have been received from Dr. Eex 

 which show an abnormal development ; the sporangium-wall is, to 

 a great extent, continuous between the threads, and forms a lattice- 

 work with wide expansions. An unusually stout form has been 

 obtained from Sikkim (K. ] 669), and named Reticularia entoxantha by 

 Berkeley, but referred by Rostafinski to Clathroptychium rugulosum, 

 I.e. ; it is an olive-black aethalium, 3 mm. thick, and bright yellow 

 within ; the threads of the sporangia are 10 fi diam., waved and 

 thickened at the margins ; the spores are yellow and spinulose, 

 9 to 11 /i. Clathroptychium Berkeleyi Mass., from Oeylon (K. 1666), 

 differs only from the robust forms of D. plumbeum in the more 

 strongly spinulose spores ; but as the spores of most gatherings vary 

 in the amount of roughness, this character alone is not sufficient to 

 mark specific difference. Clathroptychium cinnabarinum Sacc, in 

 Miohelia, i., p. 545, is said to have vermilion sporangia, with blackish- 

 purple opercula and threads ; this description applies to immature 

 specimens of D. plumbeum. 



Hab. On dead wood. — Eudloe, Wilts (B. M. 20) ; Batheaston, 

 Somerset (B. M. 292, 299) ; Luton, Beds (L:B.M.128) ; Erance (Paris 

 Herb.) ; Germany (Strassb. Herb.) ; Hungary (K. 828) ; Ceylon 

 (K. 1664); Sikkim (K. 1669); Australia (K. 834); Philadelphia 

 (L:B.M.128) ; New Jersey (B. M. 945) ; S. Carohna (B. M. 928, 

 947). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



2. D. dissiliens Hazslinszky, in Oester. Bot. Zeitsch., xxvii., 

 p. 85 (1877). Peridia pulvinate, round or oval, 2 to 5 mm. diam. ; 

 external wall chestnut-brown, dull pruinose; the inner wall, 

 together with the spores and elaters, yellow-brown. Spores 

 8 to 10 IX.. 



Hah. On willow. — Hungary. The mature peridium bursts elastically, 

 and the elaters then become three times longer. 



Genus 31.— ENTERIDIUM Ehrenberg, in Spreng. Jahrb. 

 Gewachs., I., ii., p. 55 (1818). .ZEthalium of confluent interwoven 

 sporangia, their walls perforated with large openings ; capilHtium 



