Mycol. Res. 94 (2): 231-236 (1990)
231
Printed in Great Britain
Some new Discomycete species 8
W. D. G R A D D O N
Merrivale,
Ross-on-Wye,
Herefordshire
Some new Discomycete species 8. Mycological
Research 94 (2): 2 3 1 - 2 3 6 (1990).
Ten new species of Discomycete are described: Belonopsis juncicola, Bulbomollisia striata, Crocicreas sellingensis,
fibrillosus, Hysterostegiella
Scutomollisia
crassomarginata,
Mollisia tenuispora, Mollisina
alba, Pirottaea plantaginis,
Hymenoscyphus
Psilachnum striatum and
papillata.
Key words: Discomycetes, New species.
B e l o n o p s i s j u n c i c o l a Graddon, sp. n o v .
(Fig. 1)
Apothecia sessilia ad 2 0 0 um diam, disco flavo-fuscidulo. Receptaculum nigrum. Excipulum textura-globulosum, cellulis ad
10 um, hyalinis; extus cellulis nigris. Margo angustus, hyalinis,
cellulis 6 x 3 um. Asci ad 40 x 5 um, octospori, poro iodo adjuvente
caerulescente. Ascosporae
1 2 - 1 5 x 2-5-3 urn, tenuiter clavatae,
1-septatae. Paraphyses filiformes, parte inferior furcatae, apicem
2 - 3 um.
Fig.
1. Belonopsis juncicola.
Median section, margin, base, asci,
paraphysis spores.
In culmis fund, Gorsley, Herefords., Aug. 1982, W. D. Graddon.
Holotypus in Herb. W. D. G. 3994.
From below, the apothecia show a central, hyaline mollisioid
core 6 0 um diam within a narrow ring o f dark b r o w n cells
6 um diam. T h e hyaline excipulum cells terminate, at the
surface, in a r o w o f small clavate cells so dark in colour that
they are difficult to distinguish. T h e species is placed in
Belonopsis
rather than Niptera
in view o f the proposal
by
Dennis ( 1 9 7 2 ) that the latter genus b e restricted t o species of
submerged hosts.
B u l b o m o l l i s i a s t r i a t a Graddon, sp. n o v .
(Fig. 2 )
Apothecia ad 1.25 mm diam, gregaria vel sparsa, e basis innatus
erumpentia, initio globosa, nigra, verticaliter striata dein plana.
Hymenium humectatum griseo-pallidum; margine hyalino, intacto.
Hymenium extus infra nigrum, supra pallidum, brunneo-rugulosum.
Excipulum textura-globulosum, cellulis ad 10 ym diam, marginum
versus in cellulis hyalinis, cylindraceis, ad 4 0 x 4 um terminatum.
Asci 4 5 - 5 0 x 7 - 8 um, octospori, poro minuto iodo adjuvante
caerulescente. Ascosporae 7-9 X 2 um, leniter clavatae, guttulis
minutis praeditae. Paraphyses filiformes.
interior o f the base is o f slender hyaline h y p h a e which pass
into the hypothecium. Around the base, the h o s t cells are filled
with a mass o f hyaline hyphae. T h e lower excipulum has an
outer layer o f very dark cells, the upper is hyaline
and
roughened b y small pale b r o w n cells projecting singly or in
short chains.
Ad culmis graminis, Ross-on-Wye, Herefords., June 1985, W. D.
Graddon; typus in Herb. W. D. G. 4234.
T h e innate base, t o 8 0 um high X 6 0 um diam, has a thin
wall, ca 1 2 um, o f minute b r o w n cells which, at the top o f the
base, gradually enlarge and pass into the excipulum;
the
C r o c i c r e a s sellingensis Graddon, sp. n o v .
(Fig. 3 )
Apothecia sparsa, stipitata, ad 3 5 0 um lata, pallide-flava. Excipulum
textura-oblita. Asci ad 9 0 X 7 um, octospori, poro iodo adjuvente
N e w D i s c o m y c e t e species
232
caerulescente. Ascosporae
12 x 4 um,
ellipticae,
biguttulatae.
Paraphyses filiformes, apicem clavatum ad 10 X 4 um incrassatae.
In caulibus Epilobii hirsuti, Sellinge, Kent, Oct. 1984, P. Wilbefforce.
Holotypus in Herb. W . D . G . 4226.
T h e y e l l o w colour and the spores seem to characterize the
species. I have been unable to match it wth any species
described in Carpenter ( 1 9 8 1 ) .
H y m e n o s c y p h u s fibrillosus Graddon, sp. n o v .
Apothecia
(Fig. 4)
sessilia, alba, ad 3 0 0 um diam; disco convexo. Excipulum
basaliter 4 0 um crassum, textura-prismaticum, cellulis 1 2 - 1 5 pm, in
pilis flexuosis, ad 2 0 x 2 pm excurrentibus; margine versus
decrescunt. Margo e cellulis hyalinis, cylindraceis ad 20 x 2 um. Asci
ad 6 0 x 7 um octospori, poro iodo adjuvante caerulescente. Ascosporae
10 x 13 um, fusiformes, guttulae preditae. Paraphyses filiformes,
apicem ad 3 um incrassatae.
Ad lignum Fagi, Kerne bridge, Herefords., Nov. 1981, W. D.
Graddon. Holotypus in Herb. W . D . G . 3903.
Structurally this species seems to be a Calycellina
but, these
being in general foliicolous, it is placed in Hymenoscyphus
account of its w o o d y
substrate.
on
Fig. 4 . Hymenoscyphus
fibrillosus.
Median section, excipulum and
Fig. 5. Hysterostegiella crassomarginata. Median section, margin, ascus,
paraphysis, spores.
margin, asci, paraphyses, spores.
H y s t e r o s t e g i e l l a c r a s s o m a r g i n a t a Graddon, sp. n o v .
(Fig. 5)
Apothecia erumpentia, ad 0-5 mm diam, atra; disco crassiter marginato.
Excipulum basale ad 45 um crassum, lateraliter ad 15 um; margo ad
In foliis Caricis rostralae,
Glen Affric, Inverness, M a y 1980,
R. W. G. Dennis. Holotypus in K. W . D . G . 4295.
60 um, ascos superans. Asci 6 0 x 5 um, octosporae, poro iodo
adjuvante caerulescente. Ascosporae
5 x 1 um. Paraphyses
1—1-5 um, ascos superantes ad 10 um.
filiformes,
T h e hyaline apothecial base, 1 5 0 um in diam, rests within
the upturned h o s t tissue o f which the o u t e r m o s t thin layer
Fig. 7. Mottisina alba. Median section, margin, surface hairs, asci,
paraphysis, spores.
adheres to the receptacle almost to the margin. Laterally the
excipulum is thin,
15 pm, and c o m p o s e d
o f dark
brown
rectangular cells; basally there is an inner layer o f hyaline
g l o b o s e cells but these s o o n fade out. T h e margin is much
swollen, t o 6 0 pm, and overhangs the h y m e n i u m ; the outer
part is o f dark brown cells, 1 0 x 2 pm, the inner o f similar
hyaline cells. T h e species seems well characterized b y this
margin and b y the minute spores.
M o l l i s i a t e n u i s p o r a Graddon, sp. n o v .
(Fig. 6)
Apothecia numerosa, ad 1 mm diam. rlymenium griseum, extus
pallide-brunneum, glabrum. Margine compactum. Excipulum texturaglobulosum. Asci ad 70 x 3 um, octospori, poro iodo adjuvante
caerulescente. Ascosporae 6—9 x 1 pm, tenuiter cylindracae. Paraphyses
filiformes.
Ad caules Pulicariae dysentericae, Dorking, Surrey, Sept. 1980,
R. W. G. Dennis. Holotypus in K, W . D . G . 3732.
T h e apothecia are sessile, h a v e a pale g r e y disc lacking any
conspicuous white margin. T h e r e is a central basal hyaline
core, 5 0 - 6 0 pm diam. T h e basal excipulum, 3 0 pm
gradually
thins
to
the
compact
margin.
The
thick,
species
is
characterized b y the long slender asci containing eight v e r y
slender rod-like spores.
Fig. 8. Pirottaea phntaginis.
Setae, ascus, paraphysis, spores.
Fig. 9 . Psilachnum striatum. Median section, excipular cells, hairs, asci,
P i r o t t a e a p l a n t a g i n i s Graddon, sp. n o v .
paraphyses, spores.
Apothecia sparsa, sessilia, ad 2 5 0 um diam. Hymenium pallidum, extus
pallida, supra nigro-setosa, infra nigro-punctata. Excipulum texturaglobulosa e cellulis 9 - 1 0 um diam, margine versus rectangularis,
hyalinis. Setae ad 6 0 um longae, e basi 2—4 um diam, sensim
attenuatae, fuscae. Asci ad 75 x 9 um, octospori, poro iodo adjuvante
caerulescente. Ascosporae 38—42 x 2-5—3'5 um, fusoideae, 3-septatae.
Paraphyses filiformes, apicem ad 3 um.
(Fig. 8 )
Ad caules Plantaginis lanceolatis, Islay, Argyll, June 1988, Mrs M.
Clark. Holotypus in Herb. W . D. Graddon 4426.
T h e material was seen only in the dry state. T h e densely
packed marginal setae are thin-walled, dark brown, m o s t l y
2 5 - 4 0 um long and aseptate but a few reach 6 0 um and are
1 - 3 - s e p t a t e ; all arise from rectangular, hyaline cells. T h e l o n g
spores, the thin-walled setae and its host distinguish it from
other species o f this markedly host-specific genus.
P s i l a c h n u m s t r i a t u m Graddon, sp. n o v .
M o l l i s i n a alba Graddon, sp. n o v .
(Fig. 7)
Apothecia
alba, sparsa, stipitata, ad 2 5 0 um diam; extus minute
puberula.
Excipulum
textura-prismaticum.
Asci
ad
50 x 6 um,
(Fig. 9 )
Apothecia sessilia, subglobosa, pallide grisea, ad 4 0 0 um diam.
Excipulum textura-prismaticum, hyalinum, extus piloso-striatum; pilis
ad 3 0 x 5 um, 2—3 septatis. Margine e cellulis hyalinis, elongatis,
septatis. Asci ad 4 0 x 5 um, octospori, poro iodo adjuvante
caerulescente. Ascosporae 1 0 - 1 2 X 2 um, tenuiter aciculatae, guttulii
minutis polaribus praeditae. Paraphyses supeme acutae, crassit ad
3 um, asci superantes ad 10 um.
In culmis graminum, Ross-on-Wye, Herefords., April 1978, W. D.
Graddon. Holotypus in Herb. W . D . G . 3484.
octospori, poro iodo adjuvante caerulescente. Ascosporae 7—9 x 2 um,
fusoideae, 2-guttulatae. Paraphyses filiformes ad 2 um.
In caulibus herbaceis, Crabwood prope Winchester, Sept. 1982,
W. D. Graddon. Holotypus in Herb. W . D . G . 4012.
T h e translucent grey-fawn apothecia s h o w about
eight
narrow, vertical ridges o f densely packed hyaline, 2—3-septate
hairs markedly constricted at the septa, giving barrel-shaped
cells. T h e margin is fimbriate o f similar but slightly narrower
hairs and the terminal cell m o r e acute.
Collected on an unidentified herbaceous stem. Excipulum o f
slender hyphae, 2 - 3 um, lying at a l o w angle t o the surface
which is clothed with a w e b o f typical Mollisina hairs, curved,
S c u t o m o l l i s i a p a p i l l a t a Graddon, sp. n o v .
(Fig. 10)
forked and to 2 0 um long. T h e white colour and the spores
Scutum ca 100 um diam, pallide brunneum. Apothecia
gregaria,
with a pair o f large guttules characterize the species.
sessilia, ad 5 0 0 um diam. Hymenium fusco-griseum, extus nigrum,
minute puberulum; margine compacto, tenuiter albo, cellulis
15 x 7 pm. Excipulum textura-globulosum, cellulis pallide-brunneum,
ad 11 um diam, in cellulis subglobosis, hyalinis excurrentibus.
Asci ad 4 0 x 6 - 9 pm, octospori, poro iodo adjuvante caerulescente.
Ascosporae 9 - 1 3 x 3-3-5 um, fusoideae, 1-septatae, guttulis minutis
praeditae. Paraphyses basale furcatae, septatae, apicem 4 - 6 um
incrassatae, ascos ad 15 pm superantes.
In culmis Deschampsiae caespitosae, Dymock woods, Herefords.,
August 1982, W. D. Graddon. Holotypus in Herb. W . D . G . 3993.
T h e y o u n g apothecium e m e r g e s through the centre o f the
shield. T h e thin-walled excipular cells are pale b r o w n and the
{Received for publication
10 February 1989)
surface is minutely rough with projecting subglobose, hyaline
cells. A narrow band o f dark h y p h a e separates the excipulum
from the inner flesh.
REFERENCES
CARPENTER, S. E. (1981). Monograph of Qrocicreas. Memoirs of New
York Botanic Garden 3 3 .
DENNIS, R. W. G. (1972). Niptera versus Belonopsis Rehm. Kew
Bulletin 2 6 , 4 2 9 - 4 3 3 .