Sarcostroma Insidens

''Sarcostroma'' is a genus of fungi in the family '' Sporocadaceae''. Most species of this genus are saprobes, endophytes or pathogens on leaves (Maharachchikumbura et al. 2016b, Norphanphoun et al. 2015, Farr & Rossman 2019).

The type species is ''Sarcostroma berkeleyi'' .

History

In Sir William Jackson Hooker's book, 'British Flora' (1836), English cryptogamist, Miles Joseph Berkeley (1803–1889), had described a fungal parasite (Savin leaf spot) on the leaves of ''Juniperus sabina'' and it was later identified as '' Podisoma foliicola''.Mordecai Cubitt Cooke It was found in the spring time, on living leaves, as a small sub-elliptic black excrescences (outgrowths) and it is not larger than the head of a pin.Royal Horticultural Society When Cooke re-examined the specimens in 1871, he found them to be different to other '' Podisoma'' genus species and so re-named and published it as ''Sarcostroma berkeleyi'' in Berkeley's honour.

The genus ''Sarcostroma'' was introduced by Cooke in 1872. Then British mycologist Brian Charles Sutton in 1980, reduced ''Sarcostroma'' to synonymy with the ''Seimatosporium'' genus (another Sporocadaceae family genus) that had accommodated species having 2–5-septate conidia with only a basal appendage, or without any appendages. He acknowledged the heterogeneity of the genus, and thought that ''Seimatosporium'' would or could later be subdivided. ''Sarcostroma'' was reintroduced by mycologist and lichenologist Nag Raj in 1993,Tumkur R. Nag Raj, ''Coelomycetous anamorphs with appendage-bearing conidia'', Mycologue Publications, Waterloo, Ontario, Canada (1993) to accommodate some of the species classified under ''Seimatosporium''. He still retained the genus ''Seimatosporium'' for species having a mixture of conidia with and without appendages in a single isolate, and ''Sarcostroma'' for species having multi-septate, fusiform conidia with attenuated centric apical and excentric basal appendages. Three collections treated in this study had 4-septate conidia with single centric apical and excentric basal appendages.

The inter-generic relationships and generic status of pestalotioid fungi ('' Bartalinia'', ''Monochaetia'' , '' Pestalotia'', ''Pestalotiopsis'', ''Sarcostroma'', ''Seimatosporium'' and '' Truncatella'') have all been the subject of considerable debate in the past. This has been largely due to different generic concepts, and inadequate or overlapping morphological characters used to delineate the genera within the family. Such as (Steyaert 1949, Guba 1961, Sutton 1980, Nag Raj 1993, Jeewon et al. 2002).

Later published studies which used rDNA sequence data have, however, clarified the confusion, and provided a more complete understanding of the phylogeny and the genetic breakdown for each pestalotioid fungi genus (Jeewon et al. 2002, 2003, 2004,).

Description

It was originally described in 1871 by Cooke, as having septate (divided by a septum) spores, on very long peduncles, radiating from a gelatinous stroma.Mordecai Cubitt Cooke With small sub-elliptic black excrescences (outgrowths) and it is not larger than the head of a pin.

It has conidia (an asexual, non-motile spore) 4-5 septate, simple or double apical (features located at opposite the base of an organism) appendage.E. Kiffer

The genus ''Sarcostroma'' was resurrected to accommodate several fungal species which were characterised by fusoid (having a spindle-like shaped) conidia with four or more cells, having pigmented median cells and paler, thin-walled end cells, bearing an attenuated tubular apical appendage and a similar excentric (not having the same center) basal appendage. The holotype of the genus has been reported lost and epitypification is needed (Liu et al. 2019a).

Distribution

It has a widespread,Geoffrey Clough Ainsworth scattered distribution, located in both tropical and temperate regions. Species have been found in America (in parts of North America (including Canada), Central America and South America), Europe, Africa (including South Africa,), Asia (including Japan, and China,), New Zealand, and a lot of recordings in Australia.

Hosts

''Sarcostroma sinicum'' is found in China on the leaves (seen as leaf spot) on '' Rhododendron xanthostephanum''.David F. Farr, H. Bartolome Esteban and Mary E. Palm

''Sarcostroma acaciae'' is found on various species of ''Acacia'' including ''Acacia binervata'' in Australia.Kenneth Malcolm Old, Su See Lee and J. K. Sharma (Editors)

In 1999, swollen, fissured cankers on branches of ''Eucalyptus nitens'' (about 14–19 years old) growing on the West Coast of South Island, New
Zealand. The fungal genus of ''Sarcostroma'' was first recorded from Rotoehu Forest, on the North Island in 1986 and was associated with galling on branches and leaf veins of ''Eucalyptus stenostoma''. A specimen on twigs of '' Eucalyptus regnans'' from the Rotorua area was also recorded by the Forest Research Mycological Herbarium in 1988. On this host (''E. regnans''), the fungus was associated with twig lesions and minor dieback. A further collection of the fungus was made in 1998 in the Nelson Lakes National Park, South Island where it was associated with minor dieback of a species of Eucalyptus from a mixed stand of ''Eucalyptus delegatensis'', ''Eucalyptus nitens'' and also ''Eucalyptus regnans''.

In 2003, '' Griphosphaerioma zelkovicola'' (another fungi in the family Amphisphaeriaceae) that was recorded having ''Sarcostroma'' as an anamorph (asexual reproductive stage), was first observed in Japan on the bark of '' Zelkova serrata'' tree.

Eight pestalotioid fungi were isolated from the Restionaceae (flowering plants) growing in the Western Cape Province nature reserves of South Africa. They included ''Pestalotiopsis matildae'', ''Sarcostroma lomatiae'', ''Sarcostroma restionis'', '' Truncatella betulae'','' Truncatella hartigii'', ''Truncatella megaspora'', '' Truncatella restionacearum'' and ''Truncatella spadicea''. ''Sarcostroma lomatiae'' was hosted on '' Lomatia ilicifolia'' (in the Proteaceae family) and '' Ischyrolepis'' cf. gaudichaudiana (Restionaceae family). ''Sarcostroma restionis'' was hosted on ''Ischyrolepis'' cf. ''sieberi'' and also ''Restio filiformis'' (Restionaceae). To clarify and identify the phylogenetic relationships between these and other related pestalotioid fungi, DNA sequence data was used. It also determined that a ''Discostroma'' species was the teleomorphic state of either ''Seimatosporium'' or ''Sarcostroma'' genus.

Species

In 2020, there were 17 species, more have been added. List as accepted by Species Fungorum;

*''Sarcostroma acaciae''
*''Sarcostroma africanum''
*'' Sarcostroma australiense''
*''Sarcostroma berberidis''
*'' Sarcostroma berkeleyi''
*'' Sarcostroma coryneoideum''
*'' Sarcostroma diversiseptatum''
*'' Sarcostroma insidens''
*'' Sarcostroma leucospermi''
*'' Sarcostroma lomatiae''
*'' Sarcostroma longiappendiculatum''
*'' Sarcostroma mahinapuense''
*'' Sarcostroma microsorum''
*'' Sarcostroma paragrevilleae''
*''Sarcostroma plagiochaetum''
*'' Sarcostroma proteae''
*''Sarcostroma restionis''
*'' Sarcostroma sinicum''
*''Sarcostroma zelkovicola''

Former species (all within the Sporocadaceae family);

* ''S. arbuti'' = '' Disaeta arbuti''
* ''S. brevilatum'' = '' Allelochaeta brevilata''
* ''S. cadicola'' = ''Seimatosporium cadicola''
* ''S. consocium'' = ''Seimatosporium consocium''
* ''S. daviesiae'' = ''Seimatosporium daviesiae''
* ''S. dilophosporum'' = '' Allelochaeta dilophospora''
* ''S. foliicola'' = ''Seimatosporium foliicola''
* ''S. grevilleae'' = '' Seimatosporium grevilleae''
* ''S. hakeae'' = '' Seimatosporium hakeae''
* ''S. hollosii'' = '' Seimatosporium hollosii''
* ''S. kennediae'' = ''Seimatosporium kennediae''
* ''S. leucopogonis'' = ''Seimatosporium leucopogonis''
* ''S. mariae'' = '' Seimatosporium mariae''
* ''S. parasiticum'' = '' Seimatosporium parasiticum''
* ''S. sublunatum'' = '' Seimatosporium sublunatum''

References

External links

Index Fungorum

{{Taxonbar, from=Q10661818

Amphisphaeriales
Taxa named by Mordecai Cubitt Cooke