Two new Asterina species on Michelia
champaca from Kerala, India
V.B.
Hosagoudar 1 & M.C. Riju 2
1,2 Tropical Botanic Garden and Research
Institute, Palode, Thiruvananthapuram, Kerala 695562, India.
Email: 1 vbhosagoudar@rediffmail.com
(corresponding author), 2 rcmakkiyil@gmail.com
Date of publication (online): 26
July 2011
Date of publication (print): 26
July 2011
ISSN 0974-7907 (online) |
0974-7893 (print)
Editor: R.K. Verma
Manuscript details:
Ms # o2746
Received 05 April 2011
Final received 26 May 2011
Finally accepted 06 June 2011
Citation: Hosagoudar, V.B. & M.C. Riju (2011). Two new Asterinaspecies on Michelia
champaca from Kerala, India. Journal of Threatened Taxa 3(7): 1942–1946.
Copyright: © V.B. Hosagoudar & M.C. Riju
2011. Creative Commons Attribution 3.0 Unported License.JoTT allows unrestricted use of this article in any medium for non-profit
purposes, reproduction and distribution by providing adequate credit to the
authors and the source of publication.
Acknowledgements: We thank Dr. A. Subramoniam,
Director, TBGRI, Palode for the facilities.
For figures, images -- click here
The
genus Michelia comprises
50 species, of which four are in India. Michelia champaca L. and M. nilagirica Zenk are known from Kerala State (Santapau
& Henry 1984; Sasidharan 2004; Nayar et al. 2006). The former species is endemic to South and South East Asia,
while the latter is endemic to the southern Western Ghats and Sri Lanka. Hansford (1947) and Hosagoudar &
Goos (1996) have described Asterina
micheliae and Asterostomella micheliae on the latter host from
Sri Lanka and the southern Western Ghats (Idukki forest region) of peninsular
India, respectively. Our recent
collections of Michelia champaca from
the Wyanad region of Kerala State revealed two undescribed species of the genusAsterina and
they are described and illustrated here in detail. Key to the Asterinaspecies known on the host genus Micheliahas been provided.
Asterina michelifolia sp.nov.
(Images
1–5, Fig. 1)
Materials
examined: 20.ix.2008, on leaves of Michelia champaca L. (Magnoliaceae),
Chennalode, Padinharathara, Wyanad, Kerala, India, coll. M.C. Riju, HCIO 49111a
(holotype), TBGT 3366a (isotype). MycoBank No. (MB 561622).
Coloniae hypophyllae, tenues, ad 2mm
diam., confluentes. Hyphae flexuosae vel
anfractuae, irregulariter acuteque vel laxe ramosae, formans retes arte
reticulatae, cellulae 12–40 x 3–5 µm. Appressoria dispersa, unicellularis,
opposita, alternata, unilateralis, antrorsa vel retrorsa, globosa vel
cylindracea, integra, 5–18 x 5–8 µm. Pycnothyria dispersa, orbicularis, ad 58µm diam., stellatim
dehiscentes et perlate orificium ad centro;
pycnothyriosporae globosae, clavatae, 15–20 µm, parietus glabrus. Thyriothecia dispersa, orbicularis, ad
85µm diam., stellatim dehiscentes et perlate orificium ad centro et asci
distinctum; asci globosi vel ovati, 37–45 µm diam.; ascosporae brunnneae,
uniseptatae, constrictus ad septatum, 22–25 x 10–13 µm, parietus
glabrus.
Colonies
hypophyllous, thin, up to 2mm in diameter, confluent. Hyphae flexuous to crooked, branching irregular at acute to
wide angles, forming closely reticulated rings, cells 12–40 x 3–5 µm. Appressoria scattered, unicellular,
opposite, alternate, unilateral, antrorse to retrorse,
globose to cylindrical, entire, 5–18 x 5–8 µm. Pycnothyria scattered, orbicular, up to
58µm in diameter, stellately dehisced and widely opened at the centre; pycnothyriospores globose, clavate, 15–20 µm, wall
smooth. Thyriothecia scattered,
orbicular, up to 85µm in diameter, stellately dehisced and widely opened at the
centre by exposing asci; asci globose to ovate, 37–45 µm in diameter;
ascospores brown, uniseptate, constricted at the septum, 22–25 x 10–13
µm, wall smooth.
Etymology:Specific epithet based on the host genus.
This
species differs from Asterina micheliaeHansf. reported on Michelia nilagirica from Sri Lanka
(Hansford 1947) in having typical thyriothecium and differs from A. micheligena in having straight
mycelium and larger ascospores.
Asterina micheligena sp.nov.
(Images
6–11, Fig. 2)
Materials
examined: 20.ix.2008, on leaves of Michelia champaca L. (Magnoliaceae),
Chennalode, Padinharathara, Wyanad, Kerala, India, coll. M.C. Riju HCIO 49111b
(holotype), TBGT 3366b (isotype). MycoBank No. (MB 561623).
Coloniae
epiphyllae, densae, ad 3mm diam., confluentes et saepe
et nervicolae. Hyphae
flexuosae vel anfractuae, irregulariter acuteque vel laxe ramosae, formans
retes arte reticulatae, cellulae 12–40 x 3–5 µm. Appressoria dispersa, unicellularis,
opposita, alternata, unilateralis, antrorsa vel retrorsa, globosa, integra,
mammiformes, 4–7 x 4–9 µm. Pycnothyria dispersa, orbicularis, ad 75µm diam., stellatim dehiscentes et perlate orificium ad centro; pycnothyriosporae globosae
vel leniter ovatae, 17–25 µm diam., parietus glabrus. Thyriothecia dispersa, orbicularis, ad
188µm diam., stellatim dehiscentes et perlate orificium ad centro et asci
distinctum; asci globosi vel ovati, ad 63µm diam.; ascosporae brunneae,
uniseptatae, constrictus ad septatum, 25–33 x15–18 µm, parietus
glabrus.
Colonies epiphyllous, dense, up to 3mm in
diameter, confluent and often trait along the major veins of the upper surface
of the leaves. Hyphae substraight to flexuous, branching opposite, alternate to
irregular at acute to wide angles, loosely to closely reticulate, cells 9–24
x 4–6 µm. Appressoria scattered,
unicellular, opposite, alternate, unilateral, globose, entire, mammiform, 4–7 x 4–9 µm. Pycnothyria scattered, orbicular, up to 75µm in diameter,
stellately dehisced and widely opened at the centre; pycnothyriospores globose
to slightly ovate, 17–25 µm in diameter, wall smooth. Thyriothecia scattered, orbicular, up
to 188µm in diameter, stellately dehisced and widely opened at the centre by
exposing asci; asci globose to ovate, up to 63µm in diameter; ascospores brown,
uniseptate, constricted at the septum, 25–33 x 15–18µm, wall
smooth.
Etymology:Specific epithet based on the host genus.
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