DIANEMA.] 
margauitace;e. 
205 
profuse, consisting of pale yellowish-grey, straight, rigid, slender 
threads, 0'5 to 2 yu, thick, forking at an acute angle, connected 
with each other at the opposite ends, or fasciculate, without free 
branches, minutely papillose on one side, attached above and 
below to the sporangium-wall by the suddenly acuminate 
extremities. Spores pale yellowish-grey, closely reticulated over 
the greater part of the surface with raised bands, forming a 
border 0-5 to 1 yu, broad, the remaining part marked with broken 
or very loose reticulation, 6 to 8 /a diam. — Cornuvia depressa List., 
in Journ. Bot. (1891), p. 265. 
Plate LXXIV., B.— a. sporangium, x 20 ; 5. capillitium, showing attach- 
ment of the threads to the base and upper wall of the sporangium, and 
spores, X 280 ; c. capillitium and spores, x 600 (England). 
A description of this species was given in Joum. of Botany, I.e., 
under the name of Cornuvia depressa, on account of its affinity with 
Margarita metcdlica, which at that time was included in the genus 
Cornuvia. Dr. Eex having since established the genus Dianeriia for 
the closely allied American species, it is here adopted as in every 
way the more appropriate position for this species. 
Hah. On dead wood. — Batheaston, Somerset (B. M. 2, 3, 4, 5, 96, 
300) ; St. Catherines (B. M. 19a) ; Kudloe, Wilts (B. M. 19) ; Lyme 
Regis, Dorset (L:B.M.169). 
3. D. corticatum Lister, sp. nov. Plasmodium pink. Sporangia 
hemispherical, 1 mm. diam., more often forming ring-shaped, 
elongated, or netlike plasmodiocarps 3 to 12 mm. long, shining or 
opaque, chestnut or lurid brown ; sporangium-wall ochraceous-olive, 
composed of two layers, the outer densely granular, the inner 
hyaline. Capillitium somewhat sparse, consisting of simple or 
acutely branching, slender, brown and pale threads, 0*5 — 1*5 /a 
diam., often with distant beadlike thickenings, either nearly smooth 
or marked with a single prominent spiral band, occasionally for 
a short distance with three bands ; the threads are attached 
above and below by very delicate extremities to the sporangium- 
wall. Spores brownish-pink in mass, nearly colourless when 
highly magnified, subelliptical, adhering in clusters of 4 to 6, 
minutely warted on the outer side, 10 to 12 X 8 to 9 /x diam. 
Plate LXXVII., B. — a. plasmodiocarp, x 20 ; Z>. capillitium attached to 
fragment of sporangium-wall, and clustered spores, x 280 ; o. capillitium, 
X 600 ; d, spores, x 600 (Norway). 
This species was found in some abundance on rotten planks at 
Sande, Norway, September, 1894, in company with Licea flexuosa, to 
which it bears a strong resemblance under a pocket lens. It holds an 
intermediate position between the genera Dianema and Prototrichia, 
having the general features of the former, but exhibiting in some 
sporangia the spiral bands on the capillitium characteristic of the 
latter. It differs from the species hitherto comprised in both genera 
in the more substantial sporangium -wall and in the clustered spores. 
The description of Perichcena Krupii Racib. (see p. 201) may possibly 
refer to this species. 
Hah. On rotten wood.— Norway (L:B.M. 174). 
