350 PETCH : 



blotched with orange or yellow, yellow-brown at the base, 

 where it contains rounded lime granules ; capillitium profuse, 

 dark violet, without thickenings ; spores dark violet-brown, 

 minutely spinulose, 8 /^ diameter : these were taken with an 

 abundance of typical D. effusum. In another gathering the 

 lime crystals are yellow ; wall blotched broT\Tiish-yellow ; 

 capilhtium of pale violet anastomosing threads ; spores 7 to 8 /* 

 diameter, minutely spinulose, clear violet. In a gathering on 

 lichens on jak trees the plasmodiocarps are bluish-gray, small, 

 with the lime crystals poorly developed : capilhtium threads 

 dark, forking, with triangular expansions at the axils, colour- 

 less at the extremities ; spores dark, closely warted, 13 to 16 m 

 diameter. Normal D. e^usum was found with all these forms. 

 A few of the circular plasmodiocarps are pitted in the centre, 

 but none are reaUy ring-shaped. Similar pits occur in Chon- 

 drioderma reticulatum. 



Didymium leoninum, B. & Br., Fungi of Ceylon, No. 750. 



'' Lepidoderma tigrinum, Rost," in Rostafinski, Mon., 

 App., p. 23. 



Berkeley and Broome's type specimen in Herb. Peradeniya 

 (Thwaites' 21) is for the most part immature, but one 

 fragment shows a stalk, capilhtium, sporangium wall, and 

 spores agreeing with the following description. 



Plasmodium orange-red, among dead leaves ; immature 

 sporangia the same colour. Total height about 1*5 mm. 

 Stalk yellow or yellow-brown, arising from a circular hypothal- 

 lus about 1 mm. diameter, 0'75 mm. high, 0*25 mm. diameter 

 in the middle, conical or expanding above and below, covered 

 with large angular yellow Hme granules, almost opaque when 

 mounted. Sporangium 0*7 to 0*9 mm. diameter, globose, 

 dark purple or almost black, covered by a loosely cohering 

 crust of large, stellate, ochraceous, or yellow, or almost white 

 crystals, which fall off here and there and disclose the purple 

 sporangium. Crystals of the sporangium up to 40 t^ diameter. 

 Sporangium wall stout, cartilaginous, red-browTi, areolated 

 with pale yellow lines. Columella globose, 0*3 mm. diameter, 

 yellow, thin- walled, filled with yellow lime granule. CapiUis- 

 tium of dark violet, smooth, anastomosing threads, abundant ; 

 spores pale violet-brown, minutely spinulose, 7 to 10 M. 



